BESTFIT Mainspring 513C for Cyma / Tavannes 384, ETA 36, Benrus AP & Recta M - Alloy

BESTFIT Mainspring 513C for Cyma / Tavannes 384, ETA 746, Bulova 4AM, Benrus BU & AP and Recta M movements, plus perhaps similar ébauche watches, white alloy. 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