PM Mainspring CS-355 TIME for Schuler caliber 15 Alarm / Travel Clocks

PM Packaged Material TIME side Mainspring for Schuler caliber 15 Alarm & Travel Clocks from the 1930's and beyond, PM P/N CS-355, GR Ref 44-20 C 55, HOOK-End, steel, new in open envelope. Could also very well fit in other Travel & Alarm clocks as well. 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.