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| Remarks: A calendar version of the MST 40X family, with a quicket (push button by 2) date pointer indicating on the outer edge of the dial. The day window (with Sunday in red) is not quickset, but can be adjusted more quickly by moving the hands from 9-12 then backwards from 12-9 and so on. The main differences in this movement over the base MST 401 is the additional calendar module attached to the front plate, which can be seen in the above photo. The majority of the movement parts are interchangeable, except for the cannon pinion etc. which are longer. There are two factory versions of this calibre, the original - without incabloc and the later with a redesined dial and hands, with incabloc. The cream dials on these watches does not age well, and the plated cases seem to wear badly as well - due to the high prices these watches can command, they are often redialed (especially out of India and Thailand) in other colours including black, in combination with poor movement condition (from high humidity) and incorrect hands, these can be a disaster if not purchased with care.
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| Production period: 1949 to 1953 early version, 1953-56 later version |
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| Jewels: | 17 | | Beat: | 18000 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 150 | | Minute: | 80 | | Second: | 19 | | 4th hand: | 200 | | | | | Stem tap size: | 90 |
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| Variant: | | | MST 416 | 11.5''' (25.50mm) day with quickset date pointer |
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| Common parts/Interchange |
| Multiple balance staffs possible: | | MST part number: | 7440, | interchanges with MST: | 351, 352, 364, 400, 401 | | MST part number: | 7441 (SR + SSR), | interchanges with MST: | 352, 364 | | MST part number: | 7475 (inca), | interchanges with MST: | 352, 364, 400, 401, 416 | | MST part number: | 7518 (inca II), | interchanges with MST: | 400, 401 |
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| Mainspring: | | MST part number: | 1213 | interchanges with MST: | 351, 352, 360,364, 371, 372, 400, 401, 416 | | Strength: | 0.1025 | | Height: | 155 | | Length: | 300 |
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| Watches in my collection with the MST416: |
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