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| Bulova | 5AZ |
| Brand | Bulova |
| Compatible Brand | Bulova |
| Type | Mainspring |
| Unit Type | Unit |
| Material | White Metal Alloy |
| Country Of Origin | United States |
Historically, watch mainsprings were made of carbon steel, which was highly prone to rusting, fatiguing, and suddenly snapping. These mainsprings are entirely rustproof, resistant to magnetic fields, and retain their elasticity significantly longer than old steel springs, ensuring the watch maintained a consistent power reserve.