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Hamilton 75S
Basic Information
| Name | Hamilton 75S |
|---|---|
| Alternative Name | ETA 2391 |
| Base Calibre | ETA 2391 |
| Manufacturer | Hamilton |
| Launch Year | 1960 |
| Is COSC certified | No |
Timegrapher
Beat rate
18,000 bph
Frequency
2.5 Hz
Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
Technical Details
| Lignes Dimensions | 11.5 ‴ |
|---|---|
| Dimensions | 26 mm |
| Height | 3.6 mm |
| Further Measures | Mounting Diameter (Dm): 25.6mm Stem height (T): 1.85mm Mounting Height (F): 1.4mm |
| Power Reserve | 47 hours |
| Frequency | 18,000 vph |
| Jewels | 17 |
Complications and Specifications
| Shape | Round |
|---|---|
| Complications |
|
| Shock Protection | Incabloc |
| Regulator Type | Pinned Regulator (or Index Regulator) |
| Movement Type | Manual |
| Escapement Type | Swiss Lever |
| Control Type | Balance Wheel |
| Winding Type | Stem Winding (Crown) |
| Setting Type | Stem Set (Crown Pull) |
Additional Information
| Hand Sizes | 1.50 x 0.90 x 0.21mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: stem from Hanilton, difference to ETA 2391 not known Other data: balance staff: U2226 / U3136 for balance with/without screws stem: W3355 mainspring / battery: Zf873, 1.30 x 10.0 x 0.11 x 320mm |
| Signature | ca. 1960: Silvana, Swiss Made, 17 Jewels - DH, Patented; Incabloc (ETA 2391) |
| Import Codes |
|
Compatible Parts
21 other caliber(s) share compatible parts with this caliber.
31 compatible part(s) available — Supporter feature.
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | May 26, 2026, 4:43:51 AM |
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