Definatly a Murray, probably a Monterey and could be early to mid 80's. I have a 86' Murray Monterey with the exact everything as your, down to drop outs, fork crowns and everything else. if those are the stock wheels, that is a Shimano type D coaster brake and that is a mid 70's thru late 80's model. A very good brake I may add and that is a cool bike.