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Alpina 1720
Basic Information
| Name | Alpina 1720 |
|---|---|
| Alternative Name | Moeris 19'''B |
| Base Calibre | Moeris 19" B |
| Manufacturer | Alpina |
| Launch Year | 1920 |
| Caliber Family | Description open face / hunter respectively: 291/292 : H= 5.25mm, Breguet hairspring 293/294 : H= 4.14mm, Breguet hairspring 1719/1720: H= 5.25mm, flat- or Breguet hairspring 1721/1722: H= 4.14mm, flat- or Breguet hairspring Related calibers Alpina 1719, Alpina 1720, Alpina 1721, Alpina 1722, Alpina 291, Alpina 292, Alpina 293, Alpina 294 |
| 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 | 19 ‴ |
|---|---|
| Dimensions | 43.1 mm |
| Height | 5.25 mm |
| Further Measures | Mounting Diameter (Dm): 42.5mm Stem height (T): 2.3mm Mounting Height (F): 0.55mm |
| Power Reserve | 34 hours |
| Frequency | 18,000 vph |
| Jewels | 17 |
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 | 2.00 x 1.11 / 0.20mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: hunter calibre set-lever spring between plates options: bimetallic screw balance, Breguet hairspring, Reed's regulator differences not known between 292, 1720 Other data: balance staff: U1078 stem: W1577 mainspring / battery: Zf3509, 2.00 x 17.0 x 0.21 x 500mm Ranfft mentioned about this caliber: There are variants with this quantity of jewels 15, 17 |
| Signature | ca. 1920: Alpina, 1720 |
Compatible Parts
No parts linked yet for this caliber.
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | May 26, 2026, 4:43:41 AM |
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