Hampden Balance Staff for 18s movements Factory No. 1721

ONE Hampden Balance Staff for 18s Hampden movements, Single Roller, Small Collet, Factory No. 1721, new in envelope. See images for further details. Comes from a Primrose Sonntag assortment and were made in the USA. 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 pretty good job of representing the item.