Westclox Factory Alarn Clock Mainpring SPR A-1033

Westclox Factory Mainspring for Alarm Clocks, Hole End, Factory No. SPR A-1033, for clocks from the 1940's (and perhaps beyond), new in envelope. See images for further details. Measures 4.7mm x .205mm or thereabouts. I likely have several of these so the one you get may differ slightly from the images. I sell a fine reprint of the factory parts and assembly catalog for this model of Alarm Clock if you need it, just check my other listings. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a barely adequate job of representing the item.