I don't believe that Columbia coded the production year into all of the serial numbers for their carts. For sure, your cart is much later than the 80s as Columbia didn't start using the B&S motors until the late 90s.
The good news is that Columbia is still in business and a firm associated with them is a site sponser:
https://evtechnicalservices.com/
If you navigate to that site and send an email I am sure they will be able to point you in the right direction.