I've never heard of Kings Stone but I'd assume they would be a Made in Japan "stencil" brand. More likely from the 1960s than the 50s but possibly that old (sales of these type of drums exploded after the Beatles hit but they were available before 1964 too). As such I doubt they'd be worth a lot, especially with the mis-matched "bass drum" (looks to be a floor tom conversion). For just the 3 drums maybe $150 or thereabouts. Obviously more if the hardware and snare were included.

If they sound good to you and you just want something to play they could represent a good deal on some entry level drums.

King's Stone drums were made by Star in the 60's.