Marco No. 632 Mainspring for Howard 12s Model 1913 Factory #553 - Steel

Marco Mainspring No. 632 for Howard 12s Model 1913 17-21j movements, Factory No. 553, steel, new in envelope. See image for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. mages do a pretty good job of representing the item.