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- Tissot Cal. 2403 - Balance with flat hairspring 721

| Brand | Tissot |
|---|---|
| Calibre | Tissot 2403 |
| International reference | 721 |
| State | Never used |
| Year of production | Circa 1974 |
| Caliber diameter | 12.97 mm x 15.23 mm |
| Caliber height | 3.1 mm |
| Frequency | 28'800 A/h |
| Power reserve | 37h |
| Ruby | 17 |