If you haven't checked out my Hubpages page of Made In Japan badged electric guitars from 1960-1980, you should. I've made a lot of updates, adding guitar badges and a few overlooked manufacturers from the period. If your guitar badge from this time isn't listed, tell me! I'll be happy to add it. I'll continue to do research into these 'lost' guitars...badges where we have no idea which manufacturer made them.
To date, this is the list of unknown maker badges:
Alex, Andre, Aquarius, Aquila, Asco, Aztec, Bradley, Cameo, Capri, Cipher, CG Winner, Crown, Dorado, El Degas, Encore, Fandel, Feather, Goya, Granada, Intermark, Madeira, Maier, Marchis, Maruha, Matador, Melody, Moon, Norwood, S.G.C., Sigma, Yoshi, Zim-Gar
If you have any information on the maker of any of these guitars, PLEASE contact me!