2 7/8" X 4" (73mm X 102mm)

 (dome incuse) CK in an oval // 1975

Picture courtesy Don Briel

3" X 4 3/8" (74mm X 108mm)

 (dome incuse) "backwards J"

Picture courtesy Don Briel

3 1/8" X 4 3/8" (80mm X 110mm)

 (dome incuse) 02

                 1948

{Pervomayskiy}

Picture courtesy George Sukhoff

3 1/8" X 4 3/8" (80mm X 110mm)

 (dome incuse) 1947

{Maker unknown}

Picture courtesy Bob Berry

2 7/8" X 4" (80mm X 101mm)

 (dome recess embossed) Ф / 71

{Maker unknown}

Picture courtesy Bob Berry