BESTFIT Mainspring 412E for Aurore 11, 13, NFT 525, 526, ETA 1301,1311, etc - Alloy

BESTFIT Mainspring 412E for Aurore 11, 13, NFT 525, 526, ETA 1301, 1311, Buren 350, Enicar 832, Mido 916, 917, plus perhaps many more similar ébauche watches, white alloy, new in possibly soiled envelope. See image for precise characteristics. I have several of these and the envelopes look slightly different but they are all the same mainspring. I specialize is 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.