[Shoeless Moe]

Like Scott said Pre-Shea Polo Grounds so has to 1962 or 1963 since 1964 was their first year at Shea.

To determine 62 or 63 you might have to find their ticket pricing to see if there was any difference in pricing for the 2 seasons.

Looking at Yankees 1962 & 1963 they were priced the same $1.22 plus Fed Tax .02 City Tax .06 total tax .08. So $1.30 ticket price. same as your Mets ticket so guessing the Mets had the same pricing as well in 62 & 63. Now Yankees changed Ticket color and had a different Series # between 62 & 63 so theirs are easier to determine.

There is a letter "A" after the number on yours, so could that mean 62 and 63 had a B? Possibly. You might have to do some comparing of dated 62 & 63 Mets tickets.