1952
Bill-- these appear to be normal backs for these cards. In some of the 50s sets Topps alternated the card stock in different series. The 54, 55, 59 and 60 sets also have both grey and white cards within the same series. In other cases all the cards in a series may have the same stock but differ from one series to another. In split series, one color is usually more common, but only in the 52 and 54 sets are the grey back alternatives quite rare. In the 54 set it is the first series and in 52 it is the series of cards highlighted in the title of this thread
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