I used to drool over that machine (and 2-3 more of the same) when at Brown in the early 80s. I recall they were painted white and looked like you could eat off them. At the time I had no idea about how legendary they were, but I knew they looked gorgeous.
Getting off-topic, I know. At my workplace the cafeteria employees were not contractors, they were "regular" employees of the Large Blue Company. At a certain time the decision was made to replace that with an outside food service vendor. Being the company it was, the regular employees were found new jobs inside the research building. The main chef (John Lonce) was installed in our special techniques stock room to run that service. Think: tool crib that's extra fancy and has lots of complicated researchy items.
So it happened that one thanksgiving, all the machines (yes, all painted white) were cleaned off, and John, with the help of a number of the toolmakers, produced a thanksgiving dinner that was all laid out on the ways and tables of the shop machines. A lot of the food was cooked at home and brought in, but my understanding is that John got the use of the cafeteria kitchen to do some special things also.
So, yes. Clean enough to eat off of. That was back in the day, here.