Park Sherman Vintage Brass Roller Desk Calendar

Found this cool vintage desk calendar. It's one of those old school roller types where you turn the knobs on the side to change the day and month. It has a nice heavy brass base and a green crackle finish on the metal part. Definitely has some wear and patina from age but that just gives it more character if you ask me. Perfect for a desk or a shelf if you like that mid-century look. Not sure exactly what year it's from but it's definitely an oldie. $50 obo