BESTFIT Mainspring 310K for Breitling 33, Elgin 890, Venus 240, 245, etc. - Alloy

BESTFIT Mainspring 310K for Breitling 33, Durowe 430, 435, Elgin 890, Font 522, 551, 552, 55-2, 552-2, 552-2N, 552-6, 553-2/553-2N, 55-4, Gruen 806, 807, 808, 809, 816, 817, Patek Philippe 90, Venus 240, 245 caliber movements plus perhaps similar ébauche watches (PUW 561 & Peseux 330), white alloy. 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 pretty good job of representing the item.