Doc AV, having an official list with all initials explained would be great, but I don’t expect to find such a document. We are talking about three different factories during more than 80 years of production, and only if we take into account small arms cartridges headstamps.
You mention that 30% of inspectors initials are still unknown, but in fact, from around three dozen different initials found in pistol and rifle cartridges headstamps, only 10 are identified in the latest list I have seen.
I think that I have identified 13 more, but I wish to compare this information with what others have found. Also, it seems that there are mistakes in the partial listings published so far, and that’s why I need to know the source of this information.