Vintage Isoflex Mainspring No. 340 – 1.40mm x 0.11mm x 260mm – Unbreakable Swiss Pre-owned Jewellery

Vintage Isoflex Mainspring No. 340 – 1.40mm x 0.11mm x 260mm – Unbreakable Swiss Pre-owned JewelleryVintage 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

Description:An attractive and well-detailed antique sterling silver fob medal

and the mainspring or retaining ring may exhibit mild tarnish or patina typical of age

Standing on four intricately detailed feet

Style: Openwork rose motif

suitable for mid-20th century wristwatch movements requiring a 1

it also works beautifully today as a pendant

Date display at 3 o’clock

a respected American supplier of professional watchmaking parts and tools

the piece dates to circa 1963–1986

consistent torque

” Movement marked “SWISS – SEVENTEEN 17 JEWELS

these springs were precision-tempered for durability and consistency