Bowling Pin Cuff Links Alley Strike Ball Rockabilly Set

Never was a big fan of bowling - don't hold that against me. This set is in great shape - really no clue how old they are - best guess is 70's. High polished gold plate on the backside and a sort of brushed gold on the front. 3-d bowling pins with 2 little black enamel stripes. Mechanism works fine. The disc measures 1". Only set I have.