I admit to doing all the backs for my set. I enlisted the help of Levi Bleam to run down the cards I needed. Levi pointed out that cards 94, 107, 131,145 and 156 were pulled from the 2nd sheet to allow the printing of 5 cards from the first series that were not on sheet one, 10,44, 61, 72 and 81. Then 94, 107, 131, 145 and 156 wee printed on the 3d sheet
There are some great George Vrecheck articles on the printing of the 53 set
https://r.search.yahoo.com/_ylt=AwrE...M5qwrFJoD0keA-
https://r.search.yahoo.com/_ylt=AwrE...UH7JJoqHYNd.4-