Millenary 4101 47mm

The Millenary 4101 is AP's most structurally unconventional watch: a 47mm rose gold oval housing a flying tourbillon at 9 o'clock and a fully skeletonized movement that reads as kinetic sculpture rather than dial. Collectors come to it because they want AP's horological credibility without the Royal Oak's ubiquity, and they leave with something genuinely rare in the current market.

What it is

AP introduced the current Millenary 4101 reference (15350OR.OO.D093CR.01) in 2011 as a rose gold only proposition, pairing the in-house Calibre 4101 manual-wind flying tourbillon with the oval case that has defined the Millenary line since the 1990s. The 4101 caliber beats at 21,600 vph and delivers a 72-hour power reserve, with the tourbillon cage positioned off-axis at 9 rather than the conventional 6, which reinforces the deliberately asymmetric composition. AP offered limited color and strap variations over the run but never rehoused the 4101 in white gold or platinum, keeping rose gold the only metal option for this configuration.

The reference was discontinued around 2022 when AP rationalized the Millenary line, which is starting to register in secondary-market pricing as supply tightens.

Buying notes

The skeleton bridges and tourbillon cage are fragile relative to a standard movement and do not tolerate amateur servicing or shock; always request service records and verify the work was done by AP or a certified independant with flying tourbillon experience. The crown at 9 o'clock shares the case band with the tourbillon side, so worn or damaged crowns can indicate the watch was used hard or stored carelessly against hard surfaces. Strap condition matters more than it might on a bracelet watch: the crocodile strap on this reference is curved and fitted to the oval lugs, and AP aftermarket straps are expensive.

Inspect the sapphire caseback carefully for scratches, since the movement display is a core part of the value proposition and a hazy caseback signals past neglect. Finally, confirm originality of the crown and crown tube, which are sometimes swapped during unauthorized work.

Market read

Pre-owned 15350OR.OO.D093CR.01 references trade in the $80,000 to $110,000 range depending on condition, papers, and box completeness, which represents a discount to the last retail price of around $130,000 and modest appreciation from original retail for early examples in strong condition. The discontinued status is beginning to push prices upward for unworn and full-set pieces, particularly since AP has nothing in the current lineup that directly replaces the oval flying tourbillon configuration. Expect to pay a 15 to 20 percent premium for an unworn example with full box and papers over a lightly worn equivalent; the gap is wider here than on other AP references because collectors buying this piece tend to care about presentation.

Service expectations

The Calibre 4101 flying tourbillon requires service every 5 to 7 years; AP prices full movement service for this caliber in the $4,000 to $6,000 range depending on parts required and the service center's location. Flying tourbillon regulation is specialized work and should not go to any independent not specifically experienced with AP tourbillon movements. Budget for strap replacement at service since the fitted crocodile straps run $500 to $800 from AP.