Dan:
I have not found anything definitive yet regarding the W560 set being issued later than 1927, all of the grading companies and card catalogues still have it listed as a 1927 set. That may not be correct or it could be a multi-year issue or one with updates made at a later point in time to explain some of the team changes, etc.
In general, I try to stay away from speculating on possible issue date discrepancies of every vintage baseball card set as you can begin to question just about every set ever produced if you look into it hard enough.
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