Sandalloy Mainspring S6891 – 1.50 x 0.11 x 9½” – Sandvik Steel Inc. USA

Description:
Vintage Sandalloy mainspring, made in the U.S.A. by Sandvik Steel Inc., Fairlawn, New Jersey. This premium mainspring was produced for use in Swiss watches and features Sandvik’s proprietary “Sandalloy” blend — a high-performance alloy designed to resist breakage, rust, and power loss under normal operating conditions.

Specifications:

• Brand: Sandalloy (Sandvik Steel Inc.)
• Reference: S6891
• Width: 1.50 mm
• Strength: 0.11 mm
• Length: 9½ inches
• Type: White alloy mainspring for Swiss watches
• Marked: “Guaranteed not to break, rust or lose power under normal conditions”
• Condition: New old stock (NOS), unused, supplied in original red paper envelope with wax wrap

Condition Note:
This mainspring is new old stock, complete and unused. The outer red paper packet shows light age-related wear, while the wax-sealed inner wrap remains intact and well-preserved.

Summary:
High-quality Sandalloy mainspring S6891, manufactured by Sandvik Steel Inc., USA, for Swiss watches. A durable, rustproof alloy spring ideal for period watch restoration or precision repair work.

Shipping:
As usual, this item will be packaged carefully and dispatched with tracking. International shipping is available upon request.