RN Mainspring for Longines caliber 8L, 8/68Z movements - Steel

RN mainspring for Longines caliber 8L & 8/68Z caliber movements, and quite likely others, steel, new in envelope.  I likely have several of these so the one you get may differ slightly from the images. 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.