Miracle Power Mainspring #954 for Waltham 3/0s movements No. 2230 - Steel

Miracle Power Mainspring No.954 for 3/0s Waltham Factory No. 2230, hole end, steel, new in envelope. See images for precise mainspring specifications. 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.