HR Nivastar Mainspring G789A for Elgin 12s Grade 657 & LIP R40 - Alloy

HR No. G789A Nivastar alloy mainspring for Elgin 12s Grade 657 & LIP R40, R403 caliber movements, new in dirty envelope. See images for precise mainspring specifications. The Elgin 657 is based on the French made LIP R40 movement and it not a super easy mainspring to find. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item.