HR Nivastar Mainspring G611 for Felsa 383, 384, Beguelin 511, 512, NFT 50, 51 - Alloy

HR Nivastar Mainspring G611 for Felsa 279, 282, Font 25, Beguelin 511, 512, NFT 50, 51 caliber movements, plus perhaps others, white alloy, new in 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 pretty good job of representing the item.