Looks like a mid 80's model. Awesome condition! I have never seen the California Badge before, nice. Check the rear hub, if it is a Sturmey-Archer is should have a date code on it, something like 86 5 which means the hub was made in May 1986. If is the Sachs hub it can be dated by the code...sometimes.
I have two of the Classic III's but they aren't any where as nice as yours.
Aaron