2 3/8" X 3 7/8" (60mm X 99mm)

(dome front) CONTENENTAL

            RUBBER WORKS, U.S.A.

(dome back) W.U. TEL. CO.

            PAT. 2,218,497     8-A

Picture courtesy Darryl Wagner

2 3/8" X 3 7/8" (60mm X 96mm)

(dome front) CONTENENTAL

            RUBBER WORKS, U.S.A.

(dome back) PATS : 2218497   2304483

7B

Picture courtesy David Kresz

2 3/8" X 3 3/4" (60mm X 95mm)

(Top) R 4

(dome front) CONTENENTAL  RUBBER WORKS

ERIE PA. U.S.A

(dome back) PAT 3061667 S .5-C

Picture courtesy Deborah Booker

2 3/8" X 3 3/4" (60mm X 95mm)

(Top) R 4

{pinhole 1/8 inch smaller than standard 1"}

Picture courtesy David Kresz