Newall “Security” Brand Mainspring No.1903 – 1.80 x 0.10 x 12" – Dennison 9 x 11

Newall “Security” Brand Mainspring No. 1903 – 1.80 x 0.10 x 12" – Dennison 9 x 11 – Swiss NOS

Description:
Vintage Newall “Security” Brand Swiss mainspring No. 1903, produced from high-grade tempered Swiss steel and intended for bracelet (wrist) watches. Known for their superior quality and reliability, Newall springs were widely used by professional watchmakers throughout the mid-20th century.

Specifications:

• Brand: Newall “Security” Brand

• Part No: 1903

• Width: 1.80 mm

• Strength: 0.10 mm

• Length: 12 inches (approx. 30.5 cm)

• Dennison: 9 x 11

• For: Bracelet (wrist) watches

• 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 sealed in its original paper and wax packaging. The envelope shows age-related wear and light discolouration, and the mainspring may display minor tarnish from long-term storage.

Summary:
Original Newall “Security” Brand No. 1903 mainspring, Made in Switzerland, suitable for mid-century wristwatch movements. A reliable replacement component crafted from precision-gauged Swiss material, ideal for collectors, restorers, or watch repair professionals.

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