Sandsteel Mainspring #816 for Longines 13/33 & 13/34 - Steel

Sandsteel steel mainspring #816 for Longines caliber 13/33 & 13/34 movements and perhaps others as well, new in envelope. See images for precise mainspring specifications. 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.