For those how are interested I found this ad on ebay from 1951 that has the koo koo whistle
I've wondered when those first came on the market. I suppose I could look up the patent. There's a fellow in Minnesota who has one on his 1910 two-cylinder Buick - he's owned the car since the late 1940s/early 1950s.
Is there an insinuation here that any of us are "Koo-Koo"?? If so, I can resemble that.... (Half-Zeimers already half-way there?)
Otherwise, "Where can I get one?"
Maybe I could just mount my clock on the dash? It has a pretty loud Cu-Co!