Originally Posted by Daryl Hallquist
ok, I was confused since the proofmark photo has the mark divided into three segments in a circle. Drew's chart does not show the three segment division.

You're right Daryl, it is divided into 3 segments. Also it almost looks like it is stamped A F but that could just be a poorly stamped B. The gun was proved in Suhl in October 1974, so it stands to reason that it was proved in the UK in 1975. So it was probably proved during a transitional mark period I'm guessing?