I stand corrected, Johnny. :bang_wall:The Lend-Lease pistols that came back to the U.S. had remained in virtually unissued condition, and don't ever recall seeing one with the British broad-arrow property mark. The pistols were not proofed until released by the British government for sale, the first being sold in 1952.
The proofs shown on the above Colt are post 1954 proofs. The slide and receiver should have the Crown/BNP proofs.