The P.08 with it's toggle in the open position. Ironically, the Luger was almost adopted by the United States Army. Several prototypes were made, but Luger withdrew the pistol from the competition because he knew there were major orders coming from the Swiss army and apparently retooling to make two different calibre's would have slowed production and increased cost. The First World War was also just around the corner. The .45 calibre.
Prototypes still exist and are among the most valuable guns in history.
The Luger's successor was the Walther P.38 which was easier to manufacture than the Luger and was more reliable. Proof of it's quality design is that it is still produced today for use in some armed forces. By 1938 the German army wanted a sidearm that was more rugged, more reliable under adverse conditions and that could be produced faster and cheaper than the Luger. P-38 it became the first country to adopt a double action semiautomatic. The Walther was a rugged pistol that also held eight rounds in a detachable magazine that fitted into the grip.