Citizen Original O-Ring (1 piece) / Case Seal – Ref. 392-0542 (NOS)

Original Citizen case gasket (O-ring) from old stock (NOS – New Old Stock).
This is an original Citizen spare part (“純正部品 / Genuine Parts”), individually packaged, unused and factory-designed for Citizen quartz watches.

The gasket serves as a caseback gasket and ensures a seal between the case and the caseback. It is therefore a safety-relevant component for maintaining the watch's original dust and moisture resistance.

Technical details

• Manufacturer: Citizen
• Part No.: 392-0542
• Type: O-ring / housing base seal
• Condition: NOS (unused, original packaging)
• Scope of delivery: 1 piece

compatibility
This seal was used by Citizen for various Citizen Quartz models of the 1970s/1980s , especially for classic three-hand quartz movements and corresponding cases of that era.
For Citizen seals, an exact model assignment is often case-dependent and not clearly limited to a single reference model.

➡️ Recommendation: Compare using the original Citizen parts list or by measuring the existing bottom seal.

Notice
Due to its age (NOS), it is recommended to lightly coat the seal with suitable silicone grease before installation.