BESTFIT Mainspring 513H for Universal 57/5, Bulova 10BRC, 9AR, 9AS etc. - Alloy

BESTFIT Mainspring 513H for Universal 57/5, Bulova 10BRC, 9AR, 9AS, Font 80, 190 and Cyma 420, 424 caliber movements, plus perhaps similar ébauche watches, white alloy, new in possibly dirty envelope. I likely have several of these so the one you get may vary slightly from the image. See image for precise characteristics. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item