The FN Browning Model 1900 is a semi-automatic medium-frame pistol chambered in 7.65x17mm Browning SR (.32 ACP). The M1900 was designed by John Browning, the famous arms maker credited for the ubiquitous 1911, for FN Herstal.
And was a successful design for a number of years until it was overshadowed by the 1911. What made it work and popular was its relatively simple design. It was made up of only a handful of components.
The M1900 features a single-action trigger and a spring above the barrel that helped absorb recoil, which is different from the design commonly seen today of placing the spring either below the barrel or on it.
There were only 700,000 M1900s produced and it is commonly referred to as the FN M1900, FN Mle. 1900, Browning M1900 and Browning No. 1. It has also been a favorite among both presidents and assassins alike. US president Theodore Roosevelt is rumored to have carried one. Eugen Schauman is said to have used it in his assassination attempt of Russian Governor-General Nikolai Ivanovich Bobrikov. And more.