HR Quick Fit Mainspring K611 or Felsa 383, 384, Beguelin 511, NFT 50, 51 - Alloy

HR Quick Fit Mainspring K611 for Felsa 279, 282, Font 25, Beguelin 511 & NFT 50, 51 caliber movements, plus perhaps many others, white alloy, new in envelope. See image for precise characteristics and further helpful information. 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.