Two Maxfield Parrish prints

I bought these two Maxfield Parrish prints today at the thrift store both are in very old dusty frames 11/2 x 141/2 and have small rusty nails. Both have been cut down. I took them out of the frames they both say House of Art NY. I just dont know how you tell and old print from a new one? They are printed on heavy paper with a white boarders. The two right pics are the backs of the prints the darker is the "Lute Players" . Both came from same similar frames with rusty little nails .