Watch-Craft Mainspring 3850W – 1.35 x 0.06 x 7¼" – Dennison 4½ / 15

Watch-Craft Mainspring 3850W – 1.35 x 0.06 x 7¼" – Dennison 4½ / 15 – USA NOS

Description:
Vintage Watch-Craft 3850W mainspring produced by C. & E. Marshall Co., USA. Precision-made in white alloy for non-magnetic, rustproof, and unbreakable performance. This spring is suitable for small wristwatch movements requiring a fine, narrow mainspring of moderate strength.

Specifications:

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

• Part No: 3850W

• Width: 1.35mm

• Strength: 0.06mm

• Length: 7¼ inches (approx. 18.4cm)

• Dennison: 4½ / 15

• Material: White alloy, non-magnetic, unbreakable, 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. The packaging may show signs of long-term storage, and the mainspring or retaining ring may display light tarnish or age-related patina.

Summary:
Original Watch-Craft 3850W mainspring from C. & E. Marshall Co., one of America’s most trusted vintage watch part suppliers. Ideal for watchmakers restoring mid-20th century mechanical wristwatches that use a small, lightweight barrel spring.

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