[HerbZ]

If I may add my 50 cents worth (adjusted for inflation from 2 cents), while I've known since the early 1960s that byf was a kind of code or short hand for Mauser, I never had any understanding of the suffix letter until I came upon this web site last month. I don't think my former level of ignorance concerning the suffix was particularly rare in the past, or in the present for that matter.