 
 
Their earliest brochure is dated 1964 and lists Dynamic models 10 and greater. Since the models in my brochure are mostly single digit models I think I can safely assume my brochure is pre 1964.
I'll probably just label it "early 1960's" and call it good.
I think you know more about these instruments than any other English speaker on the planet sneaky. If you can offer any refinement to "early 1960's" it would be much appreciated. Do you think 1962 would be a reasonable year for attribution? When did Yamaha start the Dynamic series?
Just so you know, I have consulted the "History of Yamaha Guitars" book and it is pretty silent on the Dynamic series. The book doesn't get excited until the emergence of the GC series. My brochure does list the Hamamatsu factory as the place of manufacture and even includes an arial photo of the factory. What a nice shot of industrial smokestacks and bland buildings.



