Republic water heater age

Hello All
Anyone know the Age of a Republic Water Heater Serial number L3 404111. Home built in 1965 and most all was original and well maintained.
Glass lined water heater. I think…RHEEM bought these guys?
Andy B

Cannot tell age from serial number but I it could be the original. I was looking through my pics for a 60’s Republic WH nameplate but could not find it. My uncle has an original in his home that was built in the early 60’s. Unbelieveable huh…