Rotary 15J Cal. Lift angle 52°. ca. 1960: AS 1691/93, Swiss, 17 Jewels; Incabloc (AS 1693, 11.5" ). Setting type Stem Set (Crown Pull). Shape Round. Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
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