Tru-Time Mainspring for FEF caliber 190, 210, 340 - Steel

Tru-Time Mainspring for FEF caliber 190, 210, 340 and perhaps others, steel, new in envelope. See image 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.