HR Quick Fit Mainspring K394 for Langendorf 5106, Oris 210, 211 - Alloy

HR Quick Fit Unbreakable mainspring K394 for Langendorf (Lanco) caliber 5106, Oris caliber 210, 211 movements, new in envelope. See images for precise mainspring specifications. 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 an OK job of representing the item.