Watch-Craft Mainspring 4177W – 1.45 x 0.09 x 10¼" – Dennison 5½ / 12 – USA NOS

Description:
Vintage Watch-Craft 4177W mainspring, manufactured by C. & E. Marshall Co., USA. High-quality white alloy spring offering non-magnetic, unbreakable, and rustproof performance. Designed for medium-sized wristwatches and small pocket watches, ensuring reliable power delivery and consistent tension.

Specifications:

• Brand: Watch-Craft (C. & E. Marshall Co.)

• Part No: 4177W

• Width: 1.45mm

• Strength: 0.09mm

• Length: 10¼ inches (approx. 26cm)

• Dennison: 5½ / 12

• Material: White alloy – unbreakable and rustproof

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

Condition Note:
This is new old stock (NOS) — unused and still sealed in its original packaging. Packaging may show age-related wear or discolouration, and the mainspring or retaining ring may display minor tarnish from long-term storage.

Summary:
Genuine Watch-Craft 4177W mainspring from C. & E. Marshall Co., a long-established American supplier of watch parts and tools. Ideal for restoring mid-century wristwatches requiring this size and strength mainspring.

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