Double Checking Age

I was at a house built in 1953 yesterday and found a fairly old furnace. My thoughts are the furnace is from 1966, but, I wanted to double check.

Furnace Information:
Magic Chef
Model #: G66-100D-5
Serial #: I 24918LDR

All thoughts will be greatly appreciated.

Thanks in Advance.


According to Prestons Guide, G66-100 is from 1980-1985.

Thanks Ian,

I appreciate the information.


According to this chart, it is 1983.