Original Item: You’re Not Going To Believe This: IMA has found a few of these night sights for the Vickers Mk I Medium Machine Gun. The first two types were luminous, using small glass vials of radium. After World War 1, the machined attachment bases for both front and rear sights were converted from the original luminous sights of World War 1 to the nonluminous sights of World War 2, so very few of the original sights survived.
