Nu Temper Mainspring No. 245 – 1.50 x 0.11 x 31.75 mm – Dennison 6 x 10

Nu Temper Mainspring No. 245 – 1.50 x 0.11 x 31.75 mm – Dennison 6 x 10 – Swiss NOS

Description:
Vintage Nu Temper mainspring No. 245, made in Switzerland. These mainsprings were marketed for their improved performance features, including undercut end tips, a low centre for smoother operation, and uniform temper for reliable torque delivery. Designed for high-grade Swiss wristwatch movements.

Specifications:

• Brand: Nu Temper

• Part No: 245

• Width: 1.50 mm

• Strength: 0.11 mm

• Length: 31.75 mm (12½ inches)

• Dennison: 6 x 10

• End Type: Tongue end

• Material: Tempered Swiss alloy steel

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

Condition Note:
This is new old stock (NOS) — unused and complete with its original vintage Swiss packaging. The envelope shows minor creases and light discolouration due to age. The mainspring remains bright and clean.

Listing is for one mainspring only; multiple available.

Summary:
Original Nu Temper mainspring No. 245, Made in Switzerland, suitable for mid-20th century wristwatch movements requiring a 1.50 mm width spring. Manufactured with superior quality control and consistent temper for optimum performance.

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