Looks like a 21 series. I'm not absolutely sure, but I think on the 22 series the "rinsed only" light changed to "please wait." Others here will know for sure.
Not a Hobart, but like one in almost every way, as Whirlpool had not yet made any significant changes. The motor should be an Emerson. No third wash armlet.
We had the "Imperial" model of this machine and it served us for 18 years until we moved and left it behind.