Vintage Isoflex Mainspring No. 340 – 1.40mm x 0.11mm x 260mm – Unbreakable Swiss

Vintage Isoflex Mainspring No. 340 – 1.40mm x 0.11mm x 260mm – Unbreakable Swiss Made

Description:
Genuine vintage Isoflex mainspring No. 340 by Douz Ressorts, supplied in its original packaging. This is a high-quality unbreakable and inoxydable (rust-resistant) mainspring — ideal for vintage mechanical wristwatches.

Specifications:

• Type: Isoflex mainspring

• Reference: No. 340

• Height (H): 1.40 mm

• Barrel diameter (Dm): 9 mm

• Thickness (Ep): 0.11 mm

• Length (Lg): 260 mm

• Material: Unbreakable steel alloy

• Brand: Douz Ressorts / Isoflex

• Qty: 1 mainspring

Condition:

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

• Packaging shows minor age wear.

Summary:
A fine example of a Swiss-made Isoflex mainspring, known for its strength and reliability. Perfect for vintage watch restoration or collection spares.

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).