While servicing an Audemars Piguet caliber 2120, I thought it would be interesting for the average, non-technical watch owner to see an inventory of the parts in a simple, high-grade watch. The caliber 2120 is a 12.5”’ (28 millimeter), 2.45 millimeter thick, automatic winding movement with hours and minutes display. It runs at 19,800 beats per hour, utilizing 36 jewels.
The parts comprising the watch are (1) the winding rotor; (2) rotor retention clip; (3) rotor bearing; (4) rotor bearing retention ring; (5) rotor support ring; (6, 7, 8, 9) rotor rim screws; (10) 21K rotor rim; (11) mainspring barrel bridge; (12) barrel bushing; (13) ball-bearing winding transfer gear outer race; (14) ball-bearing winding transfer gear inner race; (15) retention screw; (16) ball bearings (O.K. there are six!); (17) switching rocker upper jewel; (18) barrel click upper jewel; (19) reduction wheel upper jewel; (20) hand wind-disconnect wheel upper jewel; (21) switching rocker lead wheel; (22) switching rocker lower plate; |
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