The early 1980s saw the birth of several Royal Oak models with complications: Reference 25572 displays both the day of the week and the day of the month. A more advanced version with a Perpetual Calendar was also launched, under reference 5554 / 25554 (later becoming 25654).
The model is powered by the automatic caliber ref. 2120/2800 (derived from the Jaeger LeCoultre JLC 920) initially developed in 1978, and remained the world's thinnest automatic Perpetual Calendar of that time.
Caliber characteristics:
- Diameter: 28.40MM
- Thickness: 2.45MM
- Perpetual calendar module thickness: 1.55MM
- Total caliber thickness: 4MM
- Jewels: 38
- Frequency: 21600
The dial features four sub-counters:
• Day indication • Month indication • Day of the week indication • Moon phase indication
The first-generation dials are smooth, without guilloché tapestry and without tritium, featuring baton hands.
Two generations are identifiable (Series C and Series D), generally recognizable by the Audemars Piguet typography that evolved in the early 1990s.
The case remains faithful to the Royal Oak Jumbo's diameter, retaining a 39MM profile.
Illustration of ref. 5402 and 26654 with the common diameter
Production was halted around 1993, with the last units sold until 1998. The caliber was eventually replaced by reference 2120/2802, reintroducing the leap year cycle display.
The case back has a beautiful engraving: “Quantième Perpétuel Automatique”
The total number of units produced reached 800 pieces, distributed as follows:
- Yellow Gold: 422
- Steel: 272
- Gold and Steel: 72
- Platinum: 33
- Gray Gold: one unique piece
Illustration of references 256654ST and 25654BA
Illustration of reference 25654BA
Adjustments
The adjustment of the sub-counters is done by pressing buttons located along the side of the case (two on the left sides, and one on the right).
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