Excelsior #2902 TIME Mainspring for Looping Clock Model 12/13 - Steel

Excelsior No. 2902 TIME side Mainspring for Looping Model 12/13 Travel Clocks the 1930's and beyond. Could also very well fit in other travel & Alarm clocks. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. See image for precise mainspring characteristics. Images do a suitable job of representing the item.