minerva coin operated radio

I found this nice old radio at a swap meet in Miami Fl. It is a coin operated radio that operates a timer and uses quarters to play the radio. It is A M only but plays great. Does anyone have any more info on it, the tag with the model # was removed before I obtained it. Does any one have any idea what it is worth, the size of the cabinate is 28'' high x 14'' wide x 10'' deep.

Thanks for your help