WW2 military prismatic marching compass, made by T.G. Co Ltd London in 1941. ? Markings: Back engraved: T.G. Co Ltd London, Mk III, 1941 with Broad Arrow. Lid personally engraved: HMCS Hamilton 1942. ? Details: Brass body with patina, complete with original leather case. Working prismatic compass dial, luminous markings (faded with age). Produced for the British Army, later issued to HMCS Hamilton, a Canadian Flower-class corvette serving in the Battle of the Atlantic. ? Condition: Used vintage condition, with signs of wear. Leather case aged but present. Compass functional. This is a rare WW2 naval compass, not only British-made but also personally engraved to HMCS Hamilton (Royal Canadian Navy, 1942). A unique artifact directly tied to a named warship of the Atlantic convoy escort fleet.