since it has a registration outline on the carrier paper, it sounds more like either a rubdown or the varnish-set type as stronglight has (very completely) described. I wasn't going to even bring up the possibility of varnish decals cause I didn't think it possible that they'd have been in use as late as Koga-Miyata was in business...but, I've guessed wrong before. If they are varnish type, try to find someone expert to apply them for you or buy some cheap ones to practice with (and try Dr. D's suggestion). Real Copal varnish is nearly impossible to find these days, you may have to get a synthetic substitute (art supplies shop). Best of luck to you!