Sandsteel Mainspring #842 for Longines caliber 19/41 8-Day - Steel

Sandsteel steel mainspring #842 for Longines caliber 19/41 8-Day Pocket Watch, new in envelope. See images for precise mainspring specifications. Have always wanted to find one of these watches. 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.