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This is a high‑quality generic replacement screw‑down crown for the Omega Seamaster Aqua Terra reference 231.20.39 (38.5mm case), crafted in 18K rose gold finish, measuring 6.5mm (diameter) × 3.4mm (overall height). It features a screw‑down waterproof design, sealing against the case tube via internal threads and a built‑in O‑ring gasket, ensuring 150m water resistance.
Material & Finish: 18K rose gold, finely polished – warm, elegant hue matching the original.
Dimensions: 6.5mm diameter × 3.4mm overall height. Thread specification is standard Omega metric fine thread, fitting the case tube of reference 231.20.39.
Design: Screw‑down crown, sealing against the case tube via threads and an internal O‑ring, providing excellent water resistance.
Function: Manual winding (clockwise), time‑setting (pull to second position), and date quick‑set (first position, depending on the movement).
Compatible movement: The Omega Aqua Terra 231.20.39 typically houses the Caliber 8500/8501 (Co‑Axial automatic, 60‑hour power reserve); this crown matches the crown tube thread specification.
Q1: Is the 3.4mm height suitable for my case?
A: 3.4mm is the standard height for the Aqua Terra 231.20.39. If the gap between the crown and case is too large or too small after installation, the stem length may need adjustment.
Q2: Can I install without threadlocker?
A: Not recommended. The crown is subjected to vibration during screwing/unscrewing. Low‑strength threadlocker prevents loosening while allowing future removal.
Q3: The crown does not feel sealed when screwed down. What should I do?
A: Possible causes: ① O‑ring aged or incorrect size; ② Crown tube threads damaged; ③ Crown not fully tightened. Inspect the O‑ring. If threads are damaged, professional repair or tube replacement is needed.
Q4: Can this crown be used on other watch brands?
A: If your other watch uses the same thread and similar dimensions, it may fit. However, case tube length and seal design vary – always test water resistance.
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