Elgin Factory balance staff for 13/0s grade 711 thru 719 movements

One Elgin factory balance staff for 13/0s grades 711 thru 719 and 721, 724, Factory No. 6831, refill 711-264, new in probably unsealed packaging. Marshall says these also fit caliber 630 and 710 but I haven't verified that. See images for further details. 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.