HVAC and water heater age

Hey All
I need some help. I have an OLD state water heater and a Wall unit furnace (Williams Furnace Company) that i need some help getting the age.
Water Heater serial # is L90333202 and look at the pic, it is not a 1990.
Williams serial number is F0123318.

MUCH appreciated!
Andy B

Durham 029 (Small).jpg

I could not find a filter on the furnace either. Is there one somewhere?
Andy B