Piaget $20 coin watch 900B

22ct/18ct yellow gold $20 coin wristwatch. Made 1975

Brand: Piaget Made: 1975 Model: $20 coin watch Reference: 900B Calibre: 9P Movement: Manual Material: 18ct yellow gold Features/complications: Hinged case within a United States of America $20 gold coin Dial: Yellow gold dial with outer minute track featuring black printed hour markers with baton shaped hands Case dimensions: 35 mm Bracelet/strap: Leather strap Accessories: N/A SKU: 3104 Essay The coin watch is a fascinating niche area of horology. Originally the coin watch was dreamt up by brands trying to demonstrate their technical prowess in the ability to fit a movement within the thin confines of a coin. This was usually accomplished buy joining two coins together so there would be sufficient material within which a movement can sit. This was until 1957 at the Basel fair when Piaget unveiled their 9P movement showcased in a coin watch. A single coin was used, divided in half and hollowed out with a sprung cover that revealed the dial at the push of a button.