Certina 420/423 Crown Wheel with Core - Parts Compatibility Reference
Certina 420/423 Crown Wheel with Core - Parts Compatibility Reference. Technical data sheet listing the crown wheel with core assembly applicability across Certina base calibers 230, 240, 251, 260, 262, 270, 300, 320, 330, 400, 410, and 12-10, 13-10, 13-20, 15-10, 15-11, 17-10, 17-25, 17-251, 19-10, 19-25, 19-30, 19-45, 23-20, 23-30, 23-45, 23-55, 25-45, 25-65, 25-66, 28-10, and 28-15 with all variant designations. Essential reference for watchmakers identifying correct crown wheel components for Certina automatic and manual-wind movements.
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