
Since it's a K45 and not a K45SS, it precedes the solid state control models, which per my research debuted in 1979. I was thinking my machine might be 60's but now I'm more inclined to say 70's. I did however, find volts (115) and watts (250) information on the bowl's interlocking plate on the base.
#KITCHENAID SERIAL NUMBER SEARCH SERIAL#
This model was produced from 1962 to 1979, but the machines themselves don't have evident serial numbers.

I did some Googling and it seems that it's not easy to pinpoint the vintage on a K45.
