Black Shield Mainspring 480831 – 1.60 x 0.12 x 10½" – Dennison 7 / 9½ Tongue End

Black Shield Mainspring No. 480831 – 1.60 x 0.12 x 10½" – Dennison 7 / 9½ – Tongue End – Swiss NOS

Description:
Vintage Black Shield mainspring No. 480831, made in Switzerland and distributed by Swartchild & Co. A precision-crafted mainspring featuring a tongue end, suitable for medium-sized wristwatch and small pocket watch movements. Produced from high-quality tempered Swiss alloy steel, providing reliable strength and longevity.

Specifications:

• Brand: Black Shield (Swartchild & Co.)

• Part No: 480831

• Width: 1.60 mm

• Strength: 0.12 mm

• Length: 10½ inches (approx. 26.7 cm)

• Dennison: 7 / 9½

• End Type: Tongue end

• Material: Tempered Swiss alloy steel

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

Condition Note:
This is new old stock (NOS) — unused and sealed in its original paper and wax packaging. The packaging may show age-related wear or creases, and the mainspring may exhibit light tarnish from long-term storage.

Summary:
Original Black Shield No. 480831 mainspring, Made in Switzerland and supplied by Swartchild & Co. Designed for medium wristwatch calibres from the mid-20th century, offering dependable performance for restoration or repair 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).