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Frank Wakefield6 1/4" x 9 1/2" is what most folks go with for Metro Studios...
I figure that in 1930, when the Cardinals make the World Series, there is no set issued of the players. So there would not have been during the 1931 season either, at least not until after they'd won the World Series. If photographs had immediately been taken, then the images would be all quite similar. But the images are different. Some show the stands in the background, some have an artificial background, some are studio images. I think this is because when the issue was contemplated some of the subjects were gone, no longer with the Cardinals. So Metro Studios took photos of current players, then scraped together images of departed players as best they could, then offered the set of the 1931 World Champions for sale... and that would have been in 1932.
Similarly, the Cardinals won the World Series in 1926... the Middy Bread cards are 1927, not 1926, although I think the World Championship had a lot to do with baseball interest and the issuance of the Middy Bread cards the following year.