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

Sandalloy Mainspring S4247 – 1.35 x 0.07 x 8¾” – 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 Sandvik’s proprietary “Sandalloy” material — formulated to resist breakage, rust, and power loss even after long-term storage.

Specifications:

• Brand: Sandalloy (Sandvik Steel Inc.)

• Reference: S4247

• Width: 1.35 mm

• Strength: 0.07 mm

• Length: 8¾ 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, unused and still wrapped in its original wax packet. The red Sandalloy envelope shows mild age-related creasing but remains fully legible and well-preserved.

Summary:
A genuine Sandalloy mainspring S4247 made by Sandvik Steel Inc., USA, for Swiss watches. A reliable, corrosion-resistant alloy spring — perfect for professional repairs or vintage watch restoration.

Shipping:
As usual, this item will be packaged carefully and dispatched with tracking. International shipping is available through the eBay Global Shipping Programme (GSP).