Serial# HJ114 F3277 5187
Ruud is a division of Rheem. Look at Rheem style 2: http://www.buildingcenter.org/rheem-hvac
Also, whenever you see a metal data plate and can’t find any info, you can assume its past the manufacturers suggested service life.
Thank You, Home was built in 1978, so I assumed it was at least that old.