Drew;

When I was looking over the proof marks and specifically the Birmingham viewers mark I could not then and still cannot make out the letter at the top of the first viewers mark (just between the sceptre hilts); but my guess is it is a B or a D indicating that the original 13/1 bore diameter was overbored in the early to mid 1920's. Can you see what the year code was of this early viewers mark?

Last edited by bushveld; 11/10/23 12:36 PM.