Armstrong Furnace Age?

Model EG6F60DC08-3
S/N: A20072LKA
Draft induced exhaust but uses dwelling air for combustion.
Mfg under ANSI Z21.47 - A1988

This one has me stumped.

I know it’s late… but that model was manufactured between 1989 and 1992

Thanks for your reply. I made an educated guess between 1990-1991.

Preston’s has it as being manufactured from 1989-1992.