1 5/8" X 3 1/16" (41mm X 78mm)

(dome front) CONTENENTAL

            RUBBER WORKS, U.S.A.

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

            PAT. 2,218,497

Picture courtesy Darryl Wagner

1 5/8" X 3 1/16" (41mm X 78mm)

(top) R . 3

(dome front) 5-C CONTENENTAL

            RUBBER WORKS, U.S.A.

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

            PAT. 3 061 667

Picture courtesy Bob Berry

1 5/8" X 3 1/16" (41mm X 78mm)

(top) R . 3

(dome front) 1-B CONTENENTAL

            RUBBER WORKS, U.S.A.

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

            PAT. 2,218,497

Picture courtesy Deborah Booker