Yes that is a Hobart designed and built Custom 21 model. The light is the proof. I can't say when they stopped using the light but this is one of the earlier production units. I put the same exact one in My Mother in Law's condo when they went to all stainless appliances. What I really like about it is that it pauses to heat the water to 140 at the beginning of any full cycle that is selected and will actually pause at that same point to heat the water even if you start it on the longest cycle so you do wind up with some nice hot water being used throughout most of the wash.
These units had the 1400 watt sump heater like the Superbas as well as the heated 800 watt drying unit.
By now, the washarm support has probably worn to the point where it may need replacing so line one up if you are thinking of getting this beauty. They are officially NLA but they can be gotten!