Marco Mainspring #2716 for Felsa 66, 128, 123, 170, AS 545 - Steel

Marco Mainspring No. 2716 for Felsa 66, 128, 123, 170, AS 545, Tavannes 061 movements plus perhaps other similar ébauche movements as well, steel, new in envelope. See images for precise mainspring specifications. 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.