PERMA-LOY Unbreakable Mainspring for Font caliber 60, 61 - Alloy

PERMA-LOY Unbreakable Mainspring for Font 60, 61 caliber movements plus perhaps several other movements as well, white alloy, new in envelope. See images for further details and 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.