I'm guessing but it looks like based on the scan that the postcard was cut in half as there appears to be hinges upper right corner and lower left corner. If it was indeed cut in half I would wonder why as the other half would have been the address portion.
With regards to the signature of Cy Young I mentioned in an earlier post here it is, If the date is correct this would have been signed about 6 years prior. Big difference.
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jim@stinsonsports.com