Sandsteel Mainspring #847 for Longines caliber 8.23 - Steel

Sandsteel steel mainspring #847 for Longines caliber 8.23 (8/23) 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.