Introduced in 1970, Cal. 2121 was the thinnest automatic movement with a date complication. Measuring just 3.05 mm thick, Audemars Piguet based this on their existing Cal. 2120, which was designed by Jaeger-LeCoultre. It remains in production as of 2019.
- 1972-1990 Audemars Piguet Royal Oak “Jumbo” Extra-Thin, Ref. 5402
- 1992-2000 Audemars Piguet Royal Oak “Jubilee” Extra-Thin, Ref. 14802
- 1990-1998 Audemars Piguet Royal Oak “Jumbo” Extra-Thin, Ref. 15802
- Audemars Piguet Royal Oak “Jumbo” Extra-Thin, Ref. 15154
- 2012-present Audemars Piguet Royal Oak “Jumbo” Extra-Thin, Ref. 15201, 15202, 15205
