Obverse Design Triangle has four lines across. The top line says "C.Z.". The second line is the tag number which is "434" in the example above. The third line says "EXP.". The fourth and last line has the expiration date which is "7-31-69" in the example above. Reverse Design Blank Metal Brass Size and Shape Triangle 29 mm wide and 29 mm high with a small round hole at the top. Dates Issued Expired July 31, 1969. Issurer Canal Zone Government. Numbers Issued Pieces in collector hands include #434. Rarity Very rare. Manufacturer Unknown. Source King Collection Varieties None known. The 1969 dog license was somewhat similar but triangular in shape. Function Dog license. I would appreciate e-mail from anyone who can add anything to the history of this piece. Population Count Known specimens are as follows: Check #434 - David A. King Collection (pictured above).