Mainspring for Seiko 6138 and 6139 movements seiko chronograph repair

Mainspring for Seiko 6138 and 6139 movements seiko chronograph repairThis is a new Swiss made replacement mainspring compatible with the vintage Seiko movements listed below. Please note, the mainspring barrel and arbor shown in the listing images are for reference only and are not included. They are simply there to demonstrate how the replacement mainspring fits within the original Seiko mainspring barrel. While the tail of the new generic replacement mainspring doesn't fit as tightly on the arbor as the original

This is a Seiko reproduction crystal (not New Old Stock)

including vintage models like the 6309-7040 and 7549-7010

Outer Diameter: 32mm

Antimagnetic & ESD Plastic

This high-quality 2-piece FKM Rubber Vented Divers Watch Strap is available in 19mm

Capacity: 3 watches

During the 60s and 70s

5mm spring bars are included

Spare Blades: 2 spare blades per size

Type 2: High edge height

This high-quality 2-piece FKM Rubber Smooth Divers Watch Strap is available in 19mm

This set includes four high-quality precision tweezers are ideal for detailed work in watchmaking