Eliassof Bros & Co. "Regular" Mainspring for Waltham 0s Factory No. 2230 - Steel

Eliassof Bros & Co Regular Mainspring for Waltham 0s movements, Factory No. 2230, blue steel, new in envelope. See image for further details. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.