USPCC Green back decks

[Chuqii]

So I always understood USPCC to have stopped making Green backed decks around 1926, but now I found a green backed Steamboat deck from 1954 ("T" date code, two-digit zip on extra card).  So, am I correct to assume that the discontinuing green backs around 1926 just for Bicycle decks?

[touya]

In my opinion, 1954 is correct.

The yellow USPCC CODE,.
Guarantee card,.
1pack TAX STAMP, etc.
All elements point to the 40's to 50's.

My concern is that the printing on the CODE is sometimes faint and difficult to read.