Posted By:
Steve MurrayI've always referred to a card appearing in both the 150 and 350 series as a "code 2" card. Cards appearing only in the 150 series as "code 1" cards and cards appearing only in the 350 series as "code 3". I'm not real clear on the dates but think that the 150 series is 1909 and the 350 series 1910.
Code 2 card are the most common IMO.