There are what I refer to as W573-2 strip cards that have the Green (for National League teams or Sepia (American League teams) tinting just like the E120 set. Perhaps your card is a nicely cut W573 strip card?
Here is a scan showing example of the three types of W573 strip cards. The middle row contains examples of the W573-2 cards. Your Bancroft is possibly like the green tinted cards in this image. Unfortunately I did not scan the backs when I scanned the fronts...the cards all have blank backs.
Brian
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