Sho-Bro Square Neck Resonator 60s – Natural

I don’t know much about these so do your research. I cant find a serial number and no evidence of the Gretsch name that came later. It is a square neck with a sunburst finish and the fancier fingerboard. Appears to be all original. Looks like at some point it has had a neck heel repair but being a square neck the action is up high for slide playing only like a lap steel. It is in great shape otherwise. Any help would be greatly appreciated. BTW I have another one that has the Shot Jackson fingerboard and it is a 7 string and I will be listing it also if interested.