The New Model Melior was patented just before World War One, but did not go into production until 1920. It was a visual lookalike of the FN Model 1910, where the (retroactively named) Old Model Melior had been a copy of the FN Model 1900. The New Model was actually a remarkably well designed and well-made gun, with a working system quite different from the FN it was externally modeled after. It was in production until the 1950s (with a hiatus during World War Two), which is a remarkable achievement for this sort of pistol. This example is in .380 caliber, which was introduced after 1945, along with a .22 rimfire model.