Waltham Factory Mainspring for 18s Model 1870 KW No. 2206 - Steel

Waltham Factory Mainspring Factory No. 2206 for 18s Waltham Model 1870 Crescent St Key Wind, steel, new in exceedingly frail envelope. These were available in a couple of different strengths and those that I can supply can be found in the drop-down list. The 1870 Model Crescent St hold a special place in watchmaking history as the first watch specifically designed and marketed for railroad service. See image for further details. I have a couple of these so the one you get may differ slightly from the images. I inspect all these old steel mainsprings carefully before I list them and I guarantee them unconditionally. Images do a pretty good job of representing the item.