It looks six lug to me too, but I don't think there are any six lug snares from that time period with beavers, not in catalogs anyway.... still all tube lugs on lower end six-lug snares.
Student Model Radio King is an eight-lugger, but was actually the Solid Wood Shell Professional at the time frame we're addressing.
That' why the six-lug with RK lugs config has me puzzled.....
Again, better pics and more details...dimensions, etc.
I'll happily help out any with questions posed here and post here what little help I can.
Hopefully, it's help for the next cat who comes along as well, and another reason why PICTURES SHOULD BE POSTED HERE ON THE WEBSITE SO THEY WILL BE HERE IN THE FUTURE FOR HISTORICAL REFERENCE FOR OTHERS.