Sandalloy Mainspring S4247 – 1.35 x 0.07 x 8¾” – Sandvik Steel Inc. USA watch-crystal

Sandalloy Mainspring S4247 – 1.35 x 0.07 x 8¾” – Sandvik Steel Inc. USA watch-crystalSandalloy Mainspring S4247 1. 35 x 0. 07 x 8 Sandvik Steel Inc., USA For Swiss Watches NOS Description: Vintage Sandalloy mainspring, manufactured by Sandvik Steel Inc., Sandsteel Spring Division, Fairlawn, New Jersey. Designed for use in Swiss watches, this high grade mainspring is made from Sandviks proprietary Sandalloy material formulated to resist breakage, rust, and power loss even after long term storage. Specifications: Brand: Sandalloy

dependable mainspring from one of the best-known mid-century American suppliers

5mm steps)

Comes with a protective velvet gift box

Summary:Quality Swiss Altrax unbreakable mainspring No

Hands: Hour hand present

Description:Original balance wheel with hairspring for AS calibre 1712 / 1713

Stone: Black onyx (square cut)

This example is from the Series J range and features an open-face nickel-plated case with Roman numeral dial and subsidiary seconds

Please study the photographs carefully as they form part of the description

or restoration projects

Manual wind movement

24 mm case fitting → tapers to 22 mm at buckle (33 mm buckle width)