C & E Marshall balance staff E8819 for Elgin 18s No. 857 P13 Short Hub

C & E Marshall cataloged balance staff E8819 for Elgin 18s movements, Short Hub style, Pivot 13, Factory No. 857, Refill No. 3, new in envelope. See images for further details.  I likely have several of these so the one you get may differ very 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.