Description: Genuine vintage mainspring for Helvetia, Alpina, Certina, and Felsa automatic movements, supplied in original packaging from A.G. Thomas (Bradford) Ltd. Made in Switzerland and supplied as a genuine spare part, this high-quality new old stock mainspring is suitable for several mid-century Swiss automatic calibres.
Listing is for one mainspring only. Where multiples are available, some orders may not include the original outer packaging.
Specifications:
Type: Automatic mainspring
Compatible calibres:
Helvetia 836, 837, 838, 841
Alpina 664
Certina 25.072, 25.0721, 25.0723
Felsa 410, 415
Barrel diameter: 10 mm
Height: 1.45 mm
Length: 320 mm
Thickness (strength): 0.11 mm
Material: Unbreakable Swiss steel
Country of manufacture: Switzerland
Condition:
New old stock (NOS) – unused and in original packaging.
Packaging shows minor age-related wear.
Summary: A genuine Swiss-made automatic mainspring compatible with several Helvetia, Alpina, Certina, and Felsa movements — an ideal replacement part for professional watchmakers or vintage restorers.
Postage & Shipping: As usual, this item will be packaged carefully and dispatched with tracking. International shipping is available upon request.
