Need a part for this caliber? Supporters unlock the parts catalog, factory equivalents, and the donor finder that shows which other movements can supply the part you need.
Become a Supporter
Updates to data and images are welcome from our readers.
Felsa 351
Basic Information
| Name | Felsa 351 |
|---|---|
| Alternative Name | Alpina 630 |
| Manufacturer | Felsa |
| Launch Year | 1945 |
| Caliber Family | Description 350: sub second. 9" 351, 352, 358: sub second 359, 360: sweep second longer mainspring, new setting-lever spring: 720...722: sub second 725, 726: sweep second Related calibers Felsa 350, Felsa 351, Felsa 352, Felsa 358, Felsa 359, Felsa 360, Felsa 720, Felsa 721, Felsa 722, Felsa 725, Felsa 726 |
| Is COSC certified | No |
Timegrapher
Beat rate
18,000 bph
Frequency
2.5 Hz
Lift angle
52 degrees
Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
Technical Details
| Lignes Dimensions | 8.75 ‴ |
|---|---|
| Dimensions | 19.7 mm |
| Height | 3.3 mm |
| Further Measures | Mounting Diameter (Dm): 19.4mm Stem height (T): 1.7mm Mounting Height (F): 0.5mm |
| Power Reserve | 36 hours |
| Frequency | 18,000 vph |
| Jewels | 15 |
| Lift Angle | 52 degrees |
Complications and Specifications
| 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 (Crown) |
| Setting Type | Stem Set (Crown Pull) |
Additional Information
| Hand Sizes | 1.20 x 0.60 / 0.18mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: For the generation 350... two different setting-lever springs are available, but they are interchangable. differences not known between 351, 352, 358 Other data: balance staff: U537 stem: W137 mainspring / battery: Zf1013, 1.40 x 7.5 x 0.08 x 250mm balance staff ronda: 3016 (8,75) balance staff ronda: 995 (9) stem ronda: 76 (8,75) Mainspring: 1.400 x 7.000 x 0.080 x 240.000 mm |
| Signature | ca. 1945: Felsa 351, 630 - Felsa 350 (Alpina 630, Felsa 351) |
Compatible Parts
638 other caliber(s) share compatible parts with this caliber.
58 compatible part(s) available — Supporter feature.
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | May 26, 2026, 4:43:49 AM |
Loading...