Circular postmark from the other side of the postcard is clearly visible in this picture, although not the date; sellers will say "circa" because the postcard could have been sent and postmarked years after printing, so "circa" with postcards is generally understood to mean it was printed "no later than" the year mentioned. Few postcards have information on the exact year printed.
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Postcard: "Dudley Observatory, Albany N.Y." "Circa 1911" according to the auction page Circular postmark from the other side of the postcard is clearly visible in this picture, although not the date; sellers will say "circa" because the postcard could
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