Discuss calibers, share photos, and improve our database together on Discord
Join Community
Updates to data and images are welcome from our readers.
MST 522
Basic Information
| Name | MST 522 |
|---|---|
| Manufacturer | MST |
| Launch Year | 1973 |
| Caliber Family | Description 520: manual wind 521: manual, date 522: auto, date 523: auto, day, date suffix -1: minor modifications Related calibers MST 520, MST 521, MST 522, MST 523, MST 523-1 |
| Is COSC certified | No |
Technical Details
| Lignes Dimensions | 11.5 ‴ |
|---|---|
| Dimensions | 26 mm |
| Height | 4.9 mm |
| Further Measures | Mounting Diameter (Dm): 25.6mm Stem height (T): 2.2mm Mounting Height (F): 1.25mm |
| Power Reserve | 54 hours |
| Frequency | 21,600 vph |
| Jewels | 17 |
| Lift Angle | 50 degrees |
Complications and Specifications
| Shape | Round |
|---|---|
| Complications |
|
| Shock Protection | Incabloc |
| Regulator Type | Pinned Regulator (or Index Regulator) |
| Movement Type | Automatic |
| Rotor Type | Central Rotor |
| Escapement Type | Swiss Lever |
| Control Type | Balance Wheel |
| Winding Type | Automatic (Rotor-Driven) |
| Setting Type | Stem Set (Crown Pull) |
Additional Information
| Hand Sizes | 1.50 x 0.90 x 0.25mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: 1973-1976 last MST designed family Except the calendar discs all parts are usable for each family member. hacking by stopping the 4th wheel, not as common the balance. indirectly driven minute allows a big balance and low profile option: excenter device mounted on regulator (Fig.10) rotor with bayonet joint (1/4 turn of the "screw head" to release or lock the rotor) attention: right handed crown-wheel screw Other data: balance staff: MST 7535 mainspring / battery: 1.30 x 10.5 x 0.112 x 340mm replacement: Zf873, 1.30 x 10.0 x 0.11 x 320mm |
| Signature | 1-3) ca. 1975: 43, Roamer Watch Co, Swiss, Roamer Automatic, Swiss Made, 17 Jewels; Incabloc 4-6) ca. 1975: 43, Roamer Watch Co, Swiss, Roamer, 17 Jewels; Incabloc 7-10) ca. 1975: Roamer Watch Co, Swiss, Roamer, 17 Jewels; Incabloc |
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | Apr 23, 2025, 11:33:35 PM |
Loading...