BESTFIT Mainspring 183Z for Buren 690, 691, Elgin 677 Pocket Watch - Alloy

BESTFIT Mainspring 183Z for Buren caliber 690, 691 Pocket Watch movements, alloy, new in envelope. Mainspring is also suitable for use in Elgin Grade 677 movements as they were Buren based. See image for precise mainspring specifications. I likely have several of these so the one you get may differ 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.