Seiko 6139, 6138 Mainspring (also fits ETA 2892, 2893, Omega 1120)

Genuine Generale Ressorts high-quality Swiss-made mainspring, compatible with the Seiko 6139 and 6138 movements, the Omega 1120 series, and the ETA 2892 family.

The Seiko 6138 and 6139 were revolutionary movements that powered the classic Seiko chronograph watches, starting in 1969. 

The Omega 1120 and related ETA-based movements are an important bridge between the company’s earlier mechanical calibers and the later Co-Axial era. These were based on the ETA 2892 series, so this mainspring (GR25341X) fits a remarkable list of great movements.  

Compatible With:

• Seiko 6139 & 6138 (Seiko part numbers 401615 or 401616).
• Omega 1109, 1110, 1111, 1120, 1120A, 1128, 1140, 1143, 3220, 3220A
• ETA 2890, 2890.2, 2890.A2, 2892, 2892.2, 2892.A2, 2892A2, 2893.1, 2893.2, 2894, 2895.1, 2895.2
• Sellita SW300
  

Manufacturer: Generale Ressorts

Manufacturer Part Number: GR25341X

Type: Automatic with bridle/slip end

Height: 1.05mm
Thickness: 0.115mm
Length: 430mm
Barrel Diameter: 10.5mm

Amplitude Watch Parts ships from the USA, so there's no need to worry about long shipping delays or tariffs.