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A stainless steel Colt Combat Commander 1911, with a Seecamp conversion. These pictures show the thing in a little bit more detail, like the hinged front trigger setting when the hammer is cocked.
These conversions were devised by a Ludwig 'Louis' Seecamp, who was trained as a master gunsmith in pre-WW2 Germany, then served in the Wehrmacht during the war, on the Eastern Front. In a combat encounter, he saved his own life with his issued Walther P38 pistol (bearing a lifelong scar from the incident, a bullet cutting the side of his cheek and taking out a couple of teeth in the process).
This experience had a big impact on him, the double-action/single-action trigger he felt was a substantial advantage with the P38 pistol over most other service pistols at the time, being able to carry the gun with the hammer down, but then still be able to just draw and fire immediately. Given that he came to the strong opinion that point shooting was much more valuable for really close distances than using the sights, likely the situation involved him drawing and shooting from the hip, just in time, killing his opponent and shifting their aim, just lightly wounding Seecamp instead of surely killing him.
Surviving the war, and then moving to America in the 1959, he found work at Mossberg. He came to be quite appreciative of the 1911 pistol, he thought it was a very good handgun, however, the 1911 is a single-action only pistol, and he always felt that it would be even better if it was double-action/single-action, like the P38. Retiring from Mossberg in 1971, he decided to open his own business, he had patented a method to convert a 1911 pistol into a double-action/single-action automatic, and gunsmithing like this would be what his own business was all about.
Ludwig Seecamp's 1911 conversions would become the world's first DA/SA automatics chambered for .45 Auto, he would do them through his shop, as well as have them done by other gunsmiths he trained and licensed to do it.