Waltham Factory Mainspring for Model 870 - 875 Movements No. 2270 / 2242- Alloy

Waltham Mainspring for Model 870 - 875 running barrel movements, Factory No. 2270, alloy, new in envelope. This is the equivalent of a 2242 when in steel. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. See image for further details. Images do a pretty good job of representing the item.