![Seiko caliber 6139B oscillating weight part 500521 Seiko caliber 6139B oscillating weight part 500521](https://www.buzzufy.com/image/cache/catalog/demo/1210-IMG_1007-481x555.jpg)
Pre-owned oscillating weight part for chronograph watch with automatic movement of Seiko caliber 6139B. Part number: 500521
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Tags: seiko, oscillating, weight, 6139B, part 500521, caliber
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