Black Shield Mainspring No. 480291 – 1.10 x 0.08 x 3½" – Dennison 2 / 13

Black Shield Mainspring No. 480291 – 1.10 x 0.08 x 3½" – Dennison 2 / 13 – Swiss NOS

Description:
Vintage Black Shield mainspring No. 480291, distributed by Swartchild & Co. and made in Switzerland. A high-quality watch mainspring designed for small wristwatch movements, made to the precise Swiss standard and featuring a tongue end fitting.

Specifications:

• Brand: Black Shield (Swartchild & Co.)

• Part No: 480291

• Width: 1.10 mm

• Strength: 0.08 mm

• Length: 3½ inches (approx. 8.9 cm)

• Dennison: 2 / 13

• End Type: Tongue end

• Material: Swiss-made blued steel alloy

• Condition: New old stock (NOS), unused, sealed in original wrapper

Condition Note:
This is new old stock (NOS) — unused and still in its original paper envelope. The packaging may show light age wear or small marks from long-term storage, and the mainspring itself may display mild tarnish consistent with age.
Listing is for one mainspring only; multiple available.

Summary:
Original Black Shield Swiss mainspring supplied by Swartchild & Co., ideal for small vintage wristwatch calibres. Well-made, collectible, and perfectly suited for restoration projects.

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