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Movement tier: unclassified · caliber AP Cal. 4404 -- in-house automatic flyback chronograph, column-wheel, vertical clutch, 28,800bph, 70h PR, 381 parts; used in the 2021 Royal Oak Offshore Selfwinding Chronograph relaunch
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
42 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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The interchangeable strap system is reference-specific; the steel bracelet and rubber strap both use AP's tool-free quick-release, not generic spring bars.
Known issues in the market
Aftermarket rubber straps sold as "AP-compatible" lack the correct quick-release tab and lug-fit; only the AP-supplied blue rubber strap matches this reference.
Cal. 4404 is a flyback; confirm a single pusher press resets and immediately restarts the chronograph rather than the two-step stop-reset-start of a standard chronograph.
Area
What to check
What is correct
Red flag
case
Screw-locked crown and rubber-clad pushers
Crown screws down fully with consistent thread feel; pushers are blue rubber-coated and depress smoothly
Crown that cross-threads or will not seat; pushers with cracked, missing, or mismatched rubber coating
dial
Blue Petite Tapisserie pattern and registers
Fine-grid Petite Tapisserie (finer than the Mega Tapisserie used on Offshore Diver models) with tone-on-tone blue chronograph counters and white gold applied indices
Coarse Mega Tapisserie grid inconsistent with this reference; counters or indices in the wrong finish
