HR Quick Fit Mainspring K789A for Elgin 12s Grade 657 & LIP R40 - Alloy

HR Quick Fit Mainspring K789A for Elgin 12s Grade 657 & LIP R40, R403 caliber movements, white alloy, new in 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.