W and F markings on TMH

[Peter Laidler]

That's quite rare as it's a Sterling gun made for the UK Military. They got a small order for nefarious reasons. Notice that the designation, the identifier (that's the US part of the number) and the MoS/VAOS number B3/CR 53GA are all lightly roll stamped. Whereas the actual serial number part A-5725 is deeply engraved. Sterling did this so that to obliterate a serial number would damage the magazine housing and make such an act obvious.