if its a park now it could have been dropped at any time since and even pretty modern . after looking around and not seeing much at all , all i can give is my opinion and say its either somekind of token , older type of play money . it is very interesting how it vaguely mimics the older liberty head with stars coins of the mid 1800's , something that done a lot in the early 1900's to about 1930's . so i'm guessing the age to about that time period too. sorry i couldn't be more help , please repost it if you find out more about it .
Dan