Sandsteel Mainspring #845 for Longines caliber 5.16N - Steel

Sandsteel steel mainspring #845 for Longines caliber 5.16N (5/16N) 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.