Not really. It's just a late production line safety for late 44 thru45 and Post WW2 when they quit using Waffs, codes and serial numbers on many parts. Typical Armorer's replacement safeties are usually marked with codes such as S/42, 42 or 27 or Waffs such as e/63, e/655, e/214, e/135 or e/140, e/26 etc. However I don't think you could safely say that one of these couldn't have ever been used by an Armorer, especially in the Post WW2 period.