Scrod

I have a California home, built in 1948. There is a dual sided, vent less, gas, floor heater. the only name i see on it is "Royal Heater". it has 2 valves; one for burner, one for pilot. they take a key to turn. There is a view finder cap on top, which lets you see the burners and probably the pilot. I have photos of the unit. I need any info on this unit. it works great.