Black Shield Super Mainspring – For Reconvilier 2320–2322 – 1.50 x 0.09 x 12½"

Black Shield Super Mainspring – For Reconvilier 2320–2322 – 1.50 x 0.09 x 12½" – Swartchild & Co. – Swiss NOS

Description:
Vintage Black Shield Super mainspring by Swartchild & Co., made in Switzerland. A high-grade white alloy unbreakable mainspring designed for Reconvilier calibre 2320–2322 and other comparable wristwatch movements. Known for its durable construction and consistent power delivery.

Specifications:

• Brand: Black Shield Super (Swartchild & Co.)

• For: Reconvilier 2320–2322

• Width: 1.50 mm

• Strength: 0.09 mm

• Length: 12½ inches (31.75 cm)

• Dennison: 6 x 12

• Material: White alloy – rustproof, non-setting, non-magnetic, pre-lubricated

• Condition: New old stock (NOS), unused, supplied in original printed envelope

Condition Note:
This mainspring is new old stock (NOS) — unused and complete in its original packaging. The envelope shows light age discolouration and creasing, while the mainspring remains clean, bright, and ready for installation.

Summary:
Original Black Shield Super mainspring by Swartchild & Co., precision-made in Switzerland for Reconvilier 2320–2322 movements. A rustproof, non-magnetic, pre-lubricated spring ideal for restoring vintage wristwatches.

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