Waltham Factory Mainspring for 16s Timer No. 2246 - Steel

Waltham Factory Mainspring for 16s Timer Movements, Factory No. 2246, steel, new in possibly frail envelope. See images for further details. These were available in three strengths (that I know of - .016, 0.16¼ & .016½) and they are so insignificantly different I don't distinguish between them, but if it's important to you let me know and I'll see what I can supply. 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.