Do the third series Diana 58 “serial numbers” in the tap really make sense

[MDriskill]

Oddest thing to me is that the Diana number is in a hidden location. If intended as a true individual serial, we can at least say it did not function in the same sense as on contemporary BSA or Webley guns. These of course had a multi-digit serial number placed on an exterior surface, easily visible to the user, and from which the factory could identify model and manufacture date, provide replacement parts, etc.