Girard Perregaux Unique Piece Tourbillon Three Gold Bridges / PT950 / Prototype 9981

GIRARD-PERREGAUX UNIQUE PIECE - RARE PT950 THREE GOLD BRIDGES TOURBILLON CHRONOGRAPH WATCH - PROTOTYPE SERIAL NO: 00. 

REF 99150-53-821-BA6A. Caliber 9981 finely engraved mechanical movement, 46 jewels, one-minute tourbillon with three gold bridges, cream matt dial, applied silvered Breguet numerals, three subsidiary dials for constant seconds, 30-minute and 12-hour registers, case size 40mm, sapphire crystal display back, original croco leather strap fitted with original 18k white gold Girard-Perregaux deployment clasp. Box & Cert Undated.