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 upon request.
