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I came across the following signed images by Neil Armstrong, Buzz Aldrin, and Michael Collins and would appreciate your opinion on the authenticity (I have no info on the provenience, all items are from the same seller).
Signed by whole Apollo 11 crew:
Neil Armstrong signed, dedicated litho:
Michael Collins signed cut:
Buzz Aldrin signed FDC:
I'm thankful for any opinion.
The dedicated Armstrong portrait is authentic, the rest are fake. For what it’s worth, the Aldrin signed postal cover is NASA secretary.