Age of American Radiator & Sanitary Corp. furnace

I need some help with the age of a American Radiator & Sanitary Corp. furnace. House was built in 1958. It looks original.

Thanks in advance, for your input.

Some number might help!!!

Model # GUB-125 Series # E-3

Age is usually in the serial number.

It it looks origianl, it probably is.

I reported it as original.