One-Piece OC

Gillette Open Comb One Piece Twist To Open Razor Guide: Identify Your Model & Date Codes (1930s)

The Open Comb Twist to Open series began in the 1930s, adding the convenience of the Twist to Open (TTO) mechanism to an open-comb razor design. This combined the efficiency of an open comb with the quick blade-changing mechanism that became popular in this era.