Newall Security Mainspring #306 for Longines 8/47 caliber movement - Steel

Newall Security steel mainspring #306 for Longines 8/47 caliber movements and perhaps other wrist watches, new in frail envelope. See images for 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.