75th Anniversary Pin - San Diego Zoo Up for sale is a pin from the Sand Diego Zoo. The pin was made for the zoo's 75th anniversary. The pin features a gold base colour and dates from 1991. The top of the pin features a red panda over top of a large 75. The base of the pin gives the dates for the zoo. What a great piece for your tourist collection. This pin is in mint condition. There is no scuffing or scratching to the graphic on the pin. There is no rusting or pitting on the pin. This pin measures .75 (L) x 1 (H) inches. All items can be returned within 3 days of receipt if you are not satisfied with the item. The buyer pays return shipping. The seller will issue a full refund upon return receipt of the item in the same condition as it was originally sent.