Note that the font from your bat is slightly different than the other example, and this one:
https://www.greyflannelauctions.com/lot-39841.aspx
The "S" and first "2" are more flat, but the last two are not.
So my guess is your bat is slightly later than these, because the font was corrected.
Circa 1971?
I am sure others here will know way more than me.