Excelsior #2839 ALARM Mainspring for Mauthe TUW 34 Alarm / Travel Clocks

Excelsior No. 2839 Mainspring for Mauthe TUW 34 based Alarm and Travel Clocks the 1930's and beyond. This is the ALARM side mainspring in steel. Could also very well fit in other travel & Alarm clocks. Note while the mainspring is new the envelope has been handled quite a bit over the years so it's probably a bit dirty. I likely have several of these so the one you get may differ slightly from the images. See image for precise mainspring characteristics.