Audemars Piguet Royal Oak

About this reference

The Audemars Piguet Royal Oak reference 4100BA was produced from the late 1970s through the 1980s as the first mid-sized execution of the model line. Collectors target this 18k yellow gold reference for its 35mm case diameter, which offers a traditional alternative to the larger "Jumbo" proportions. It features the self-winding Calibre 2123, a movement derived from the Jaeger-LeCoultre 889. The construction includes an integrated bracelet and a monobloc case design consistent with the original Gérald Genta aesthetic. Most examples feature the "Petite Tapisserie" dial pattern with an applied AP logo at 12 o'clock. On the secondary market, the 4100BA typically trades between $35,000 and $55,000 depending on condition and the presence of original paperwork. A notable production detail is the transition from "Audemars Piguet" script to the block logo on later dials, which influences specific collector preferences for early-series aesthetics.