I think Frankoma pottery will become more collectable in the years to come. I'm surprised that there hasn't been more interest in the topic but, all of their works were well marked, taking out the mystery aspect?
They did make some really cool stuff IMHO.
I actually was given a domain name and data from the last owner of Frankoma. (Thanks again Joe R!) http://artpotterymanufacturers.com/
I haven't updated it in years but I retained most of the info there but changed the look back then. He bought the facility & tried to make a go of it. Hats off for that aspiration & am sorry it didn't work out.
He was obviously a lover of USA pottery as the most developed page was "Companies Still in Existence"...http://artpotterymanufacturers.com/Factories.html
Anyway, it's similar to painters' works becoming more valuable after death. A limited amount to be had.
I hope more folks come to appreciate the effort from OK.