That is a really difficult question to answer.
On the PC backs the common view of the baseball cards is 1954-1955 but that is speculative. It doesn't hold true with the few boxers I've found. Joe Louis and Jake LaMotta were retired by then but they and Larkin are the three PC back boxers I've seen. The FB issue seems to have PC backs from all purported years of the issue but I've not checked every card. Perhaps someone else knows for sure.
The colored cards are rare. The green ink cards, while very hard to find, are the easiest of them; the colored stock cards are nearly impossible. I have not cataloged enough colored cards to opine on issue date.
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