Excelsior #2932 ALARM Mainspring for Looping Clock Model 50/51 - Steel

Excelsior No. 2932 ALARM side Mainspring suitable for Looping Model 50/51 Travel Clocks the 1930's and beyond. Could also very well fit in other travel & Alarm clocks. 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.