Seiko 6139, Seiko 6138, Omega 1120, ETA 2892A2 compatible mainspring (GR)

Genuine Generale Ressorts high-quality Swiss-made mainspring

If you're servicing a Seiko 6139 or 6139 movement, you want to use a high-quality mainspring from a reputable manufacturer. Why take chances with a no-name mainspring that might cause fitment issues with the arbor or barrel, or which might not provide a strong amplitude? Generale Ressorts, of Switzerland, is the highest-quality maker of aftermarket mainsprings. 

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

Compatible With: Seiko 6139, Seiko 6138 (Seiko part numbers 401615 or 401616), Omega 1120, ETA 2892A2, Sellita SW300

Manufacturer: Generale Ressorts

Manufacturer Part Number: gr25341x

Type: Automatic withbridle/slip end

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