Lid stamped C.P.Ry. in front at lid latch. The last Patent Date on Bottom reads AUG 22 - 82; and starts with SEP 6.70; MAY 20.73; AUG 26.73; AUG 31.75; & OCT 18.80 they are easy to read. Stamped on the lid at left bail handle location is: PATD ~ FEB 19.78.
