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mcFly
Posted June 9, 2025 - 2:57pm

In reply to by Hereward

214 movement  so a Accucell 1 battery is best bet to play it safe it has original lower 1.35v that the watches originally used  - ebay and other watch sites sell them altho pricey - if its been rephased for cheaper priced 1.55v modern batteries then a 387s is the typical replacement   - altho 394 might work as well   - both should be the silver oxide type   - looks like a swiss case with the larger M7 stamp and the style of hands  - some real expert will chine in eventually