Another bit of info I gleaned from my "composed pair" of Ithaca 410 guns, the serial numbers indicated a particular year of manufacture, yet delivery dates from Walt indicated a few years later on one. That scenario might be an explanation for the 1929 example Drew has shown, vs the 1933 "legitimizing" of the 3" 410 in the U.S..
Also, although my two guns started production together and were given very close s/n's, they received different style forends, the change in style being a demarcation of production years.
