Marco Mainspring #2739 for Langendorf 2, Gruen 266, 267, 785, 861 - Steel

Marco No. 2739 steel mainspring for Langendorf (Lanco) caliber 2 & Gruen caliber 266, 267, 785, 861 movements perhaps others as well, 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 a pretty good job of representing the item.