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| MST | 520, | 521 | | Ligne | 12''' | 12''' |
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| Remarks: This is the hacking manual version of the MST52x series - all (appropriate) parts being interchangeable accross the family. This movement was the final MST designed movement family and was developed in conjunction with Tissot and Certina (although solely a Roamer design). The movement features a large balance, beat correction, hack acting on the 4th (seconds) wheel, solid bankings and an extremely interesting click design on the ratchet wheel. |
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| Production period: 1973-76
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| Jewels: |
17
| | Beat: | 21600 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 150 | | Minute: | 90 | | Second: | 25 | | | | | Stem tap size: | N/A |
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| Variant: | | | MST 520 | 12''' (26mm) direct sweep seconds | | MST 521 | 12''' (26mm) direct sweep seconds, date |
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| Common parts/Interchange |
| Balance Staff: | | MST part number: | 7535, | interchanges with MST: | 520, 521, 522, 523 |
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| Mainspring: | | MST part number: | 1309 | interchanges with MST: | 520, 521, 522, 523 | | Strength: | 0.112 | | Height: | 1.30 | | Length: | 380 |
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| Watches in my collection with the MST520: |
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