Excelsior #2990 TIME Mainspring for Imhof Model 549 Alarm / Travel Clocks

Excelsior No. 2990 Mainspring for Imhof Model 549 Alarm and Travel Clocks the 1930's and beyond. This is the TIME side mainspring in steel. 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. Images do a suitable job of representing the item.