BESTFIT Mainspring 511M for Benrus BH, BK, BT, CD, Bulova 4AF, Omega 23.4 - Alloy

BESTFIT Mainspring 511M for Benrus BH, BK, BT, CD, Bulova 4AF, Felsa 410, 415, 690, Omega 23.4, Font 10 caliber movements, plus perhaps similar ébauche watches, white alloy, new in frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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 marginally suitable job of representing the item.