TOPIC: furnace age

Anyone able to help me on this one?  The label was in a place where my head didn't fit so I took a picture, hoping for the best.  I took three just to be sure.  I can clearly read most of it but I can't find a make.  The model no is PBNU-LO16N120O  The serial no is EMAM 424507
This information is from and an ANSI sticker that says 1990 and the appliance was certified by the American Gas Association.  Apparently they stopped certifying in 1997 so that suggests this furnace was built between 1990 and 1997.  Anyone recognize the model no or the serial no pattern?
Thanks.

Bert-
I think I know the manufacturer - Hamilton Home Products out of Ohio - Your model # seems to match their WUN Type upflow single stage -  try going to www.hamiltonhomeproducts.com/resource-manuals-furnace.htm If you scroll down on their webpage to find the PBNU model install manual it defines the model code in the manual.  I think it matches what you found-Hope this helps
DrBob

Karma for you Dr. Bob.  Thank you very much.  Found the exact model no there.  Now that I know the make, I am making an educated guess at the Year of Manufacture to be 1992.