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Seiko 4N21-5050
The Seiko 4N21-5050 watch movement is a self-winding mechanical movement developed and manufactured by Rolex. It is a certified Swiss chronometer, having passed the Swiss Official Chronometer Testing Institute (COSC) tests. The movement features a Parachrom hairspring, which provides increased shock and temperature resistance. Its architecture, typical of all Oyster watch movements, ensures exceptional reliability.
The Seiko 4N21-5050 features the following functions:
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|
Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
Documents
Parts Listing
| Part Description | Reference # | Alternate | Buy |
|---|---|---|---|
| MAINSPRING, 1.16 X .112 X 21" | MSN-44 | GR 2825-X | Buy part |
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