Thanks skeettx, I knew the 1410 was the gram weight but had never seen the marks, which look more like qmus than Gmos. They are very lightly stamped on this example and rather small too. Sometimes things just don't connect. Was the starting weight of the barrels as they left the proof house or was it of the raw barrels before final striking and finish? I would assume it was after final finish as a means of knowing whether the guns were still in proof?