PM Mainspring CS-431 TIME for Swiza Cal. 19/50 Alarm / Travel Clocks

PM Packaged Material TIME side Mainspring for SWIZA caliber 19/50 Alarm and Travel Clocks from the 1930's and beyond, PM P/N CS-431, GR Ref 38-19 C 86, regular tongue-End, steel, new in packaging. Could also very well fit in other Travel & Alarm clocks - pretty sure it fits caliber 56 and it looks like it's a pretty close match for many others.  See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find parts so I usually have whatever you might need and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item.