Thrift store purchase.

- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring
- Seiko Electra 360 Unbreakable Mainspring