Black Shield Mainspring 4865768 1.90 x 0.09 x 14½" – Dennison 10/12 Tongue End

Black Shield Mainspring No. 4865768 – 1.90 x 0.09 x 14½" – Dennison 10 / 12 – Tongue End – Swiss NOS

Description:
Vintage Black Shield mainspring No. 4865768, made in Switzerland and distributed by Swartchild & Co. This high-quality Swiss-made mainspring features a tongue end and is suitable for medium-to-large wristwatch or small pocket watch movements. Crafted from durable tempered Swiss alloy steel, designed to provide reliable strength and long service life.

Specifications:

• Brand: Black Shield (Swartchild & Co.)

• Part No: 4865768

• Width: 1.90 mm

• Strength: 0.09 mm

• Length: 14½ inches (approx. 36.8 cm)

• Dennison: 10 / 12

• 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 still sealed in its original paper and wax packaging. The packaging may show light wear, creasing, or age spots, and the mainspring may exhibit mild tarnish from long-term storage.

Summary:
Original Black Shield No. 4865768 mainspring, Made in Switzerland and supplied by Swartchild & Co., a trusted source of horological materials. Suitable for medium to large wristwatch and small pocket watch calibres, commonly used in mid-20th century Swiss movements.

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