"I know I have seen the mark that looks like T printed over M somewhere, but I can't place it"
Think hard please
Did it also have the crown and cross over it?
When I obtained this gun at an estate auction I purchased it as a "German Guild Gun" it was advertised that way - based on the assumption that the crown was a an old Suhl proof mark - Also the stamp with the word "stil" in various places means "style" in German...When I looked at the other marks such as "choke" they certainly appeared English such as the 12C inside the diamond which is an old English mark indicating gauge....; I knew all of these things appeared to be contradictions - but the look and feel of this gun is typical of a pre world war II high grade English boxlock game gun - I examined it closely and the quality is excellent in every respect - and the wood is beautiful - so the origin was not a concern at the time - I fell in love with it
and the price was right - I can tell you the handling, balance and feel of this gun is superb!!
