Today we are taking a look at the different variations in .455 caliber Webley-Fosbery automatic revolvers. The two main types are the Model 1901 and Model 1903 (the Model 1902 was the very rare .38 caliber version). The main change between the two is the change from a coil mainspring to a V mainspring, to improve reliability when dirty; done in response to British military testing. In addition the 1903 has an improved fire control mechanism, a lower hammer profile and a new cylinder removal system.

Within the Model 1903, there is also a change from a standard frame and cylinder to shortened versions of both. These changes occurred at about serial number 3350, in 1912. The shortened cylinder was made to fit the new Webley MkII ammunition, which was notably shorter than the MkI type - and a shorter cylinder reduced weight.