Mainspring for Longines 10.25 - 10.26

Height, diameter, thickness and length

1.45 × 9.5 × 0.10 × 340 mmheight × diameter × thickness × length

Note: We have transcribed this information to the best of our knowledge from the Générale Ressorts mainspring catalogue (GR 2, 1974). All information has been carefully checked but is provided without guarantee. Please check yourself before fitting that the mainspring fits, in particular height, diameter, thickness and length.

📏 Mainspring dimensions

GR no.	Height	Diameter	Thickness	Length	Type
3955-T	1.45 mm	9.5 mm	0.10 mm	340 mm	Hand-wound, special bridle (T)

All dimensions in millimetres. The height of a mainspring is often also called its “width”. Source: Générale Ressorts, mainspring catalogue GR 2 (March 1974), page 126.

🛒 Matching mainspring in our shop

According to the catalogue, this mainspring has a special form (Hand-wound, special bridle (T)). We therefore do not show shop items automatically here – feel free to write to us. Contact form

🔗 According to the catalogue, the same mainspring (GR 3955-T) also fits

Longines 11.26

❓ Frequently asked questions

Which mainspring fits the Longines 10.25 - 10.26?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.45 × 9.5 × 0.10 × 340 mm (GR 3955-T, hand-wound, special bridle (T)).