Pocket watch: movement of an extremely rare, super thin Cartier chronograph with register,

Pocket watch: movement of an extremely rare, super thin Cartier chronograph with register, probably calibre Audemars Piguet, ca. 1920 Dial ca. Ø42mm, extremely thin high quality movement, probably Audemars Piguet, 26 jewels, regulated in 8 positions, lever escapement, chronograph with register, signed wonderfully preserved silver dial, 30-minute register, intact, but cleaning necessary, rarity in this version. Taschenuhr: Werk eines extrem raren, super flachen Cartier-Chronographen mit Register, vermutlich Kaliber Audemars Piguet, ca.1920 Zifferblatt ca. Ø42mm, extrem flaches Werk von sehr hoher Qualität, vermutlich Audemars Piguet, 26 Steine, justiert in 8 Lagen, Ankerhemmung, Chronograph mit Register, wunderbar erhaltenes, signiertes Zifferblatt aus Silber, 30-Minuten-Register, gangbar, jedoch reinigungsbedürftig, Rarität in dieser Ausführung.