Westclox Factory ALARM Mainspring for Mascot Model 72 Travel Clocks

Westclox Factory ALARM Mainspring P/N SPR-3256 for Westclox Mascot Model 72 travel clocks from the 1940's and beyond, new in frail envelope. Could also very well fit in other travel clocks. Mainspring is not pristine but is perfectly usable as-is and needs a thorough cleaning before use. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a suitable job of representing the item.