Imperforate blocks of the Colombian Bank Note Co.'s 1944 printing of the
ABNC petroleum stamp design. The block on the left may represent a proof
printing as it is produced on yellowish paper that differs from the issued stamp.
The imperforate block on the right is either an imperforate proof or a
production error as it is on the same paper as the issued stamp.

© Peter A. Scholle, 2000

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