Hi Brian nice looking bow you have there...I beleave your correct,most all of Herter's bows were built in one of several massive wood working opperations...I beleave they were build same deal as Herters walnut gun stocks...All cut by in house wood-workers,employed by Herters....In the serial number of your bow,there should be two numbers together....if it's a 1964?? the numbers 64 would be in the serial number I think about the middle of the serial number...I would also like to add some of the finest rosewood ever imported was used in Herter's bows..There are some fine looking fine shooting bows........bowdoc