whats making this hard is, a lot of guitar companies from germany in the 60's used each others ideas,,catseye soundholes,headstock styles , etc. if ya look up Hoyer guitars you will see the same catseye soundholes,without numbers of any kind its kind of a crap shoot,,but its definately a german builder that made your guitar. might be worth something might not... keep us posted though,im curious. lol