Vintage Altrax Mainspring No.318 – 1.90 mm × 0.21 mm × 17 mm – Unbreakable Swiss

Vintage Altrax Mainspring No. 318 – 1.90 mm × 0.21 mm × 17 mm – Unbreakable Swiss Made NOS

Description:
Genuine vintage Altrax mainspring No. 318, Swiss Made and supplied in its original plastic case. A high-quality unbreakable and non-deforming mainspring, ideal for restoring or servicing larger vintage wristwatches or small pocket watches.

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. 318

• Height: 1.90 mm

• Thickness (strength): 0.21 mm

• Barrel diameter: 17 mm

• Material: Tempered unbreakable steel

• Brand: Altrax

• Country of manufacture: Switzerland

Condition:

• New old stock (NOS) – unused and in original case.

• Packaging may show minor age-related wear.

Summary:
A genuine Swiss-made Altrax unbreakable mainspring No. 318 in its original case. Perfect for watchmakers, collectors, and restorers working with larger vintage Swiss movements.

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).