Saw this at an antique shop today, couldn't for the life of me figure out
what it is. The label says Honeywell "Potentiometer", but it sure seems to
look like more than that!

"Standard Cell" as mentioned on the yellow tag in one of the photos is one
of those calibrated battery cells that was talked about on RAR+P a while
back, right?

Just curious if anyone can tell me something about it.