PM Mainspring for Waltham 0x & 3/0s No. 2230 - ONYX Steel

PM Mainspring for Waltham 0s & 3/0s, Factory No. 2230, ONYX Steel, new in double envelope and foil. See image 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.