Vintage Mets jacket at Great Adventure in like 1976 or 1977

Here’s my cousin rocking a Mets jacket back at Great Adventure like 35 years ago.  My guess is this is 1976 or 1977.

Remember the olden times when this and a cap were the only kind of Mets gear you could even buy?  A custom jersey of whoever you wanted was completely unheard of….really it was only about 12 years ago when that became a thing unless you went to Cosby’s over by MSG and dropped some coin.