Marco No. 630 Mainspring for Howard 12s Model 1908 Factory #552 - Steel

Marco Mainspring No. 630 for Howard 12s Model 1908 17-21j movements, Factory No. 552, steel, new in frail 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.