The Christmas card has a drawing and a personal note from corporal Adolph to the schurks, I have a pic around here on another computer think it was 1915/16, but they were obviously old friends.

These tubes are not Damascus but as of now I’m sticking to my low pressure(very low) reloads. Can you get any date from the other marks, I feel much safer after 1905. Bores measure .670 .673 marked 17/1