BESTFIT Mainspring 211K for Fleurier 150, 153, BFG 780, 783 - Alloy

BESTFIT Mainspring 211K Fleurier caliber 150, 153, BFG 780, 783 plus perhaps similar ébauche watches, white alloy, new in envelope. See image for precise mainspring specifications. 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.