Steel lock developed by the Smith & Egge Company. The shackle front was incised "SMITH & EGGE MFG. Co." and the case front embosed "U S MAIL" by the manufacturer. This lock was adopted by the Post Office Department in 1880.
U.S./ MAIL / 1882
Height x Width x Depth: 3 x 2 x 1/2 in. (7.62 x 5.08 x 1.27 cm)