PLATINUM AUDEMARS PIGUET STAR WHEEL REF. 25720, SOLD IN 1992 Three body circular brushed and polished platinum case, n. D8231, stepped bezel, curved lugs, sapphire caseback. Not original strap and platinum AP buckle. 
Silvered dial with guilloché decoration, signed, arched white section for minutes, three transparent rotating discs with Arabic numerals indicate the hours.
Signed self-winding movement, rhodium-plated caliber 2124, n. 368531, 33 jewels, rotor with ball bearing and 21K gold insert, lever escapement, monometallic balance adjusted for heat and cold, isochronism and five positions, flat hairspring, KIF shock-absorber, hack-mechanism.
Fitted with Audemars Piguet box and Extract from the Archives.
Diameter Ø: 36 mm
Note: working.