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fkwBlue Ribbons are all different sizes. All are 3.5" tall, by 1.4 to 3" wide. Thin high quality glossy stock, blank back, very thin facsimile signature.
Here is one I just picked up.

The Blue Ribbon Malt cards are far different than any of the Cubs team issue cards.
The rare team issue (1932) has whited out backgrounds.
The picture pack ones are much larger.