Thank you, Researcher, for the history. I knew it was in the 50s but did not remember the exact date. I had bought my first, personally owned shotgun in '54, the old J Stevens Arms & Tool Co 12 ga, which I have determined must have been a 325 model. I started my Junior year of high school that same year. I remembered those "Baby Magnums" appeared on the market around that same period, just didn't recall exactly when.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra