Help with a black backstamp ceramic platter mark - JK or K

by Michelle
(NC, USA)

I picked this platter up at an estate sale a few weeks ago. It looks to me to be from the 1970s due to the design and colors. The original owner claimed it was Fire King from Anchor Hocking, but I think she's wrong because I don't recognize the mark at all. Any thoughts? This one is really stumping me, I can't even tell if it's a "JK" or simply a cursive "K". Thanks for your time!