It's a Goose, if it were a 70/71 it would have came with 5" Taco style wheels. Since it has 6" Ruttman wheels, it'd have to be 72 or later. It does look like a short frame so it is possible that someone put 6" wheels on a 5" wheel bike sometime in it's life, maybe the scrub brake brackets are throwing me off?. If the serial tag has rivets, it would be 72 or earlier, I haven't seen any 73-later bikes to have rivet tags. Not to say they don't exist, I just haven't seen any.