A caliber is a family of engineering decisions. This index grows from researched technical documentation and individual inspection notes.
| Caliber | Maker | Type | Family | Research note |
|---|---|---|---|---|
| 5606 ↗ | Seiko | Mechanical · automatic | Lord Matic | 23-jewel examples; day-date; date-change mechanism requires care |
| 7C43 ↗ | Seiko | Quartz · diver | Professional Diver | Professional tool-watch caliber; technical sheet pending |
| 35SQ ↗ | Seiko | Quartz · historic | Quartz Astron | 1969 launch · 8,192 Hz oscillator · approx. ±5 sec/month |
| 6106 ↗ | Seiko | Mechanical · automatic | Seiko 5 / Actus | Family under review; avoid merging individual reference variants |
| V657 ↗ | Alba | Quartz · chronograph | ALBA | Candidate caliber pending verification |