Vintage USA McCoy Numbered Green Pottery Urn Vase

I believe this is a 1950's - 1960's McCoy numbered vase. Marked USA on the bottom and number 594. Vase is green with a brown mottled gloss glaze. The vase stands 8 1/4" tall and is 4" in diameter. A nice size. The vase is in good condition, some pits in the glaze. Crazing all over the vase but hard to see. A small nick on the very bottom of the vase. If it is not McCoy, please let me know. Thanks for looking.