I have an FN Model 1900 in near-mint condition. I don't shoot it much any more, but when I did, it was always very reliable, and I would not have hesitated to use it as a personal defense weapon. The only problem is with the grips. I believe they were gutta-percha (a type of rubber) containing wood flour filler, and insects will eat holes in the grips. I kept the damaged originals, but put a pair of plastic replacement grips on it instead. There were a lot of 1900s made, I think about 750,000, so they are not anywhere near rare. But those in better condition don't show up often. You may not know this, but it was the very first commercially-sold pistol operated by the blowback principle, as developed by John Browning. Many were used in the trenches during WWI, and the FN Model 1900 was a favorite of the French Foreign Legion for many years. At one time, it was thought to have been the pistol used in 1914 by Gavrilo Princep to assassinate Archduke Franz Ferdinand and Duchess Sophie in Sarajevo, thereby starting WWI, but that is not correct. Princep used the improved FN 1910 model in .380. The Model 1900 was never chambered in any caliber other than .32 ACP.