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Mainspring
For Hamilton 21
1.28 x 0.130 x 420 x 11.5 mm
Height (H): 1.28mm
Thickness (T): 0.13mm
Total Length (TL): 420mm
Barrel Diameter (BD): 11.5mm
End Type: Manual
To look for similar mainsprings that exactly match a specific dimension, select it from the links above.
GR Approximation
This mainspring does not have a GR reference. The following GR mainsprings are the closest fit, when values differ the exact value is shown brackets for reference:
Movement Listing
This mainspring is used by the following movements:
| Movement | Description | Ligne |
|---|---|---|
| Bulova 3434 | ACCUTRON CASE REFERENCE | |
| Bulova GT3685 | BULOVA CASE REFERENCE | |
| Citizen 4-S044413 | ||
| Citizen 4-294335 | CITIZEN CASE | |
| Citizen 4-K08111 | CITIZEN CASE | |
| Citizen 4-S044413 | ||
| Omega 17278 | OMEGA USES CALIBER 580 | |
| Seiko 2906-0330 | SEIKO CASE REFERENCE | |
| Seiko 4N00-6114 | SEIKO CASE 951201 | |
| Seiko 7121-7000 | SEIKO CASE REFERENCE | |
| Seiko 7N89-6C30 | SEIKO CASE REFERENCE COSERVE 2003/2004 | |
| Seiko V031-5110 | ||
| Seiko Y100-5950 | PULSAR CASE REFERENCE | |
| Seiko Y563-875L | USE Y563-8559 |
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Similar Mainspring Listing
This mainspring is similar to the mainspring used by the following movements. A similar mainspring differs slightly in one or more dimensions but may possibly still work as a replacement. When values differ the exact value is shown brackets for reference:
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