The Korriphila HSP-701 and why it matters

In 1984, a brand-new Colt Python cost less than $500. That same year, a tiny shop in Heidelberg, Germany, began taking orders for a semi-automatic pistol with a starting price around $2,000, before options. No dealer network to speak of. No ad campaign. Output is capped at fewer than 30 guns a year, each one built by hand to the buyer's specifications.

That pistol was the Korriphila HSP-701. Four decades on, collectors who own custom 1911s, Korths, and vintage SIG P210s still put it at or near the top of the pile. A clean 9mm example with its case brought 30,000 euros at Hermann Historica in 2024. Not bad for a single-stack pistol that almost nobody needed and very few people ever saw.

So what is this thing, who built it, and why does it still matter? Let's start with the man.

The man from the proof house

Edgar Budischowsky is a hard figure to pin down. The Firearm Blog calls him Czech. Wikipedia says West German. The name itself points east. What's better documented is where he worked: Ulm, home of one of Germany's proof houses, and later Heidelberg. Several accounts say he trained as a gunmaker in Ferlach, Austria, the old-world capital of that trade, though details of his early life are thin and come mostly from secondary sources. I'll flag that plainly rather than pretend otherwise.

His first commercial design was the TP 70, a stainless double-action pocket pistol in .22 LR and .25 ACP that appeared in 1968. It blended ideas from Colt and Walther into something small, dense, and unusually well made for its class. Korriphila-Präzisionsmechanik GmbH in Ulm built it first. From 1973 to 1977, Norton Armament (Norarmco) of Mount Clemens, Michigan, produced it under license as the Budischowsky TP-70. The general view among collectors is that the Michigan guns were good, while later production from Florida and Utah fell off sharply.

Watching a carefully designed project get built down to a price seems to have left a mark. When Budischowsky drew his next pistol, cost wasn't going to be part of the conversation at all.

The pistol itself

The HSP-701's patent was granted in 1979. Production began in 1984 in Heidelberg, one gun at a time, each built to order.

The basic recipe: a full-size, all-steel, single-stack centerfire pistol with a fixed barrel and a roller-delayed blowback action. Most were chambered in .45 ACP. Buyers could also order 9mm Parabellum, .30 Luger, .38 Super, or .38 Special Wadcutter, and there are references to 10mm and 9mm Ultra as well, though few if any of the unusual calibers appear to have been built. Barrels came in 4- or 5-inch lengths. The trigger could be a traditional DA/SA, double-action only, or single-action only. Finishes were a deep blue that lands somewhere between matte and high gloss, a silver finish, or Damascus steel on the rare Odin's Eye model. Magazines held seven rounds in .45 and nine in 9mm.

The control layout is where the design philosophy is most evident. There's exactly one external control: the slide release, which doubles as a decocker. No thumb safety, no separate decocking lever, nothing else to snag or fumble. Safety comes from a firing pin block that only clears when the trigger is pulled, plus a long, smooth double-action first pull. A small pin above the hammer sticks out when a round is chambered, so you can see or feel the gun's condition in the dark.

On early guns, you decocked by pushing the slide release down past its normal stop. Later guns required you to thumb the hammer while pressing the lever, a small change among many quiet, undocumented revisions Budischowsky made over the years. Held down with the slide forward, that same lever locks the slide shut. One part, three jobs, and none of them feel like a compromise when you work the gun.

These are heavy pistols. Even the 4-inch version weighs close to 40 ounces empty, which is more than plenty for full-size steel 1911s. Nobody was pretending this was a pocket gun.

One roller under the bolt

Roller-delayed blowback should sound familiar. It's the operating system Heckler & Koch built an empire on, from the G3 rifle through the MP5 and the P9S pistol, all tracing back to Ludwig Vorgrimler's wartime work. Budischowsky's version is his own, though. Where the H&K guns use two rollers pushed sideways into recesses, the HSP-701 uses a single roller set in the bottom of the bolt, riding against a recess in the frame, below the bore.

Why bother? Two reasons, and they compound. First, the barrel is fixed to the frame. It never tilts, and it never has to find its way back into battery. Fixed barrels are why guns like the H&K P7 and the P9S shoot so well, and the Korriphila belongs to that family. Second, the geometry places the bore low in the hand, so recoil comes straight back rather than levering the muzzle up.

A plain blowback .45 would be brutal. The roller delay changes that. Owners describe the recoil as a quick, sharp shove with very little muzzle flip, and the numbers back up the accuracy claims. Every gun shipped with a factory 5-shot Ransom rest target fired at 25 yards, and surviving targets show groups near an inch. When the German magazine Visier tested three HSP-701s in 1990, the best 5-inch 9mm put five rounds into 22mm at 25 meters. That's under an inch, from a defensive pistol, at a distance where plenty of service guns struggle to stay inside four.

Jeff Cooper shot two samples and came away impressed, which was not a courtesy he extended often to double-action autos. Ken Warner recorded his verdict in Gun Digest, where Cooper called the pulls clean and the recoil light in a gun of that weight.

1984 was a strange year to build this

Think about the market the HSP-701 walked into. Police departments were finishing their move from revolvers to semi-autos, and the double-stack 9mm was clearly the future. The Glock 17 had just been adopted in Austria. The Beretta M9 would start replacing the 1911 in American military holsters within a year. Capacity was the conversation. Polymer was the horizon.

And here comes a hand-built, single-stack, all-steel .45 with a seven-round magazine and a price north of four Pythons.

Here's the thing, though: the gun only looks out of step until you see where it was pointed. In America, specifically. The test targets were shot at 25 yards rather than 25 meters. The size and profile of the original 4-inch gun echoed the Smith & Wesson Model 39. The manual pitched it as a big-bore pistol you could carry safely with a round chambered in it. In the era of Cooper's Gunsite and the rise of serious defensive pistolcraft, a .45 with a short, crisp trigger and no external safety made sense to a particular kind of American shooter. A shooter with money.

Did many of them buy one? No. That was never the plan. The plan was to build the best pistol Budischowsky knew how to build and let the price be whatever it turned out to be.

How rare is rare?

Honest answer: nobody outside Budischowsky's old workshop knows exactly.

The figure you'll see everywhere is around 400 pistols total, which traces back to a 1990 report in Visier. Production ran at fewer than 30 guns a year, and proof dates on surviving examples run from 1984 through at least 1992. The serial numbers don't run in one tidy sequence either. Collectors have documented a sub-100 block from the early years, a 700 series from around 1986, an 800 series from 1987, a 900 series with proof marks into the 1990s, and a 1200 series. The Firearm Blog's writers, who own two of them, suspect the 400 figure is actually generous.

So treat any precise total with suspicion. What's certain is that they surface rarely, that .45 ACP and 9mm make up nearly all of them, and that the odd calibers and configurations (wadcutter guns, single-action sport triggers, stainless frames, the Damascus Odin's Eye) are measured in single digits or close to it.

Korth, the inevitable comparison

You can't write about the Korriphila without Korth coming up. Willi Korth's shop in Ratzeburg had been building what many consider the finest double-action revolvers in the world since the 1960s, and in 1987, Korth released its own hand-built semi-auto, a few years behind Budischowsky's.

The two guns are constantly lumped together. Same era, same country, same boutique scale, similar money, and names that start with the same four letters. Mechanically, they have almost nothing in common. The Korth auto uses a falling-block lockup mounted forward in the gun; the Korriphila sticks with its fixed barrel and roller. Collectors who own both tend to give the Korth full marks for material quality and finish, then hand the win to the Korriphila on feel and function. The Firearm Blog's head-to-head put Budischowsky ahead by a slim margin and ranked the HSP-701 alongside the forged Swiss SIG P210-6 as the finest factory semi-autos ever made. Auction results tell a similar story of near-parity: at Hermann Historica's 100th sale, an early Korth 13E brought 42,000 euros, and the HSP-701 brought 30,000.

What they cost now, and what to check

In 2016, American examples generally traded between $7,000 and $10,000. Since then, the ceiling has moved. The 30,000-euro Hermann Historica result in 2024 involved a particularly nice 5-inch gun with its leather case, and asking prices on specialist dealers' sites have followed the auctions upward. Published book values sit lower than recent live results, which is common for guns that trade this thinly. A handful of sales a year doesn't make much of a price curve.

If you're seriously hunting one, a few practical notes:

• Documentation carries real weight here. Because every gun was built to order, the factory test target, manual, tools, invoice, and original box or leather case do a lot of work confirming what a particular pistol is supposed to be. Several auctioned examples retained all of it.
• Check the proof date against the serial range. German proof marks carry a date code, and the known serial blocks give you a rough cross-check. A mismatch deserves questions, not assumptions.
• Unusual claims need unusual proof. One-off configurations were normal for this shop, which cuts both ways. A "one of one" story can be true and still be unverifiable. Factory paperwork or period documentation is the difference.
• Parts are effectively unobtainable. Owners shoot them sparingly for exactly this reason. Budget your round count accordingly, and treat a gun with a broken or replaced part as a much harder purchase to make.
• US guns may wear importer marks, such as the International Gun Co. stamp seen on a 1985 example sold through Rock Island. That's normal for the type, not a defect, but it matters for originality-minded buyers.
• European purchases mean export paperwork. German auction houses state plainly that these guns need an export license and, depending on where you live, an import permit or a dealer to receive them. Build that time and cost into your plans, and confirm the current rules yourself rather than relying on an article. I'm not a lawyer, and this isn't legal advice.

One thing I'd gently push back on: buying one of these as a financial play. Prices have risen, sure. They can also sit unsold for a long time at ambitious asks, because the pool of buyers is tiny. Buy one because you want the object, not because you've penciled out a return.

Why it matters

Strip away the auction results, and the HSP-701 is important for a simple reason: it's one of the very few pistols ever built with no budget constraint at all, by a single designer answering to nobody, and it actually delivered. Plenty of expensive guns are expensive because of engraving, gold, or a famous name on the slide. The Korriphila is expensive because of what's under the bluing: solid billet steel, hand fitting so tight that owners describe the assembled pistol as feeling like one piece, and a mechanism nobody else was using in a handgun, executed to proof-house standards.

It also matters as a control sample. The entire industry moved in one direction in the 1980s: toward more capacity at lower prices. Budischowsky went the other way and proved the road not taken led somewhere real. The Firearm Blog's reviewers called it "a Patek Philippe in a world of Casio G-Shocks," and the comparison holds up. A G-Shock is the sensible choice. It always was. The Patek is the one people cross a room to see.

Fewer than a few hundred people will ever own an HSP-701. That's fine. Its value to the rest of us lies in knowing the ceiling exists and that one stubborn man in Heidelberg actually reached it.