Actually Coopers are very popular in NorCal, thanks to Bicycle Odessy in Sausalito, among others, who imported them. I've seen a lot or Ron's work hereabouts over the years. Here's an interview he gave to a Mr. Sheffield where there is a lot of reference to NorCal, and seems he passed the torch on to a Mill Valley builder when he retired:
http://www.veloworks.com/roncooper/r...interview.html
I seem to recall seeing either him or just his work at one of the NAHBBS shows in San Jose, am I right?