Kitchenaid model G help

[bee-vac]

Hello all,
I have a Kitchenaid model G that I'm trying to date. The serial number is 21181. Could anyone tell me about what year this one was made?

 

[kenkart]

1930s

I think, but I dont know exactly how many years it was made...but I will tell you one thing, it is a zillion times better than these old things called KA today, you could mix cement with it!..I have 2 of them and a model F.

 

[bee-vac]

I read online that the engraved KitchenAid "drip rings" were started around 1937-1938. What are "Drip rings" on a model "G"?