Citizen Spare Part 392-0020 (1 piece) – Case Back Gasket – NOS

Original Citizen case back gasket with reference 392-0020 (Citizen item no. 91433920020) from unused old stock (NOS). Offered is a single piece, taken from an original Citizen packaging (純正部品 / "5 PCS"). On the original label, the part is referred to as "Oリング" (O-ring); technically, it is the case back/cover gasket.

This gasket is listed for a range of Citizen case references, including 4-852524, 4-850980, 4-851021, 4-851111, 4-851307, 4-851463, as well as 4-S070252 / 4-S070261 / 4-S070279 (and others). It seals the case back and is essential for restoring the original water resistance.

The part is unused and ideal for the professional overhaul of classic Citizen watches for which suitable original gaskets are now hard to come by.

Manufacturer: Citizen Watch Co., Ltd. (純正部品 / Japan).

Warranty (used) This is an original part (NOS) stored for decades. The limitation period for claims for defects (statutory warranty) is 12 months from delivery.

Note As this is an old stock gasket, the material may lose elasticity or become brittle due to age. Therefore, water resistance cannot be guaranteed; the gasket should be inspected before installation and only installed by a professional.