Another "dead give-away" on the edge of a replacement part to it being a modern copy/fake is if it's been Laser cut and not either punched or a normal smooth stock edge. This is for the simple reason that I don't believe that they had C.N.C. Laser cutting machines during WW2 and immediately Post War. It's easy to be caught out by this and slightly embarrassingly I have myself once or twice since I work in the metalworking industry. Looking carefully at the edge of metal there is a difference between a Laser cut part and a punched part or normal stock edge. The reason that "Fakers" will often use Laser cut parts nowadays is that they don't have to make hard tooling.