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The movement caliber is Very Rare (ETA SA Manufacture
Horlogère Suisse,
Grenchen, Switzerland) 17 Jewels:
| Name | ETA 939 |
|---|---|
| Manufacturer | ETA |
| Launch Year | 1951's |
| Caliber Family | Description 900: 10.5" , sub second 901: 10.5" , sweep second 930: 11.5" , sub second 932: 11.5" , sweep second |
| Is COSC certified | No |
| Lignes Dimensions | 10.5 ‴ |
|---|---|
| Dimensions | 23.69 mm |
| Height | - |
| Further Measures | Mounting Diameter (Dm): 23.35mm Stem height (T): 1.7mm |
| Power Reserve | 41 hours |
| Frequency | 18,000 vph |
| Jewels | 15 |
| Shape | Round |
|---|---|
| Complications |
|
| Regulator Type | Pinned Regulator (or Index Regulator) |
| Movement Type | Manual |
| Escapement Type | Swiss Lever |
| Control Type | Balance Wheel |
| Winding Type | Stem Winding |
| Setting Type | Stem Set |
| Hand Sizes | 1.50 x 0.90 x 0.20mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: differences not known between 901, 939 likely just different bridge designs (cf. ETA 900) Other data: balance staff: U3060 / U1424 hairspring collet 0.5mm/0.6mm stem: W832, W1161 mainspring / battery: Zf1269, 1.55 x 9.0 x 0.10 x 290mm balance staff ronda: 829 (10,5-11,5) stem ronda: 1 (10,5) |
| Signature | 17 Jewels |
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