Vintage Altrax Mainspring No.231 – 1.55 mm x 0.09 mm x 8.5 mm – Unbreakable

Vintage Altrax Mainspring No. 231 – 1.55 mm x 0.09 mm x 8.5 mm – Unbreakable Swiss Made NOS

Description:
Genuine vintage Altrax mainspring No. 231, Swiss Made and supplied in its original packaging. A high-quality unbreakable and non-deforming mainspring, ideal for servicing or restoring smaller vintage manual-wind wristwatches.

Listing is for one mainspring only. Where multiples are available, some orders may not include the original outer packaging.

Specifications:

• Type: Unbreakable mainspring

• Reference: No. 231

• Height: 1.55 mm

• Thickness (strength): 0.09 mm

• Barrel diameter: 8.5 mm

• Material: Tempered unbreakable steel

• Brand: Altrax

• 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 Altrax mainspring, offering superb durability and precision. Perfect for watchmakers, collectors, and restorers seeking reliable vintage parts.

Postage & Shipping:
As usual, this item will be packaged carefully and dispatched with tracking. International shipping is available through the eBay Global Shipping Programme (GSP).