Error printings of petroleum-related aerograms are not
common. This example from the Emirate of Abu Dhabi
is missing the red-orange color (in reality the sheet
was inverted prior to addition of the red print so that
it appears at the very top (shown) and on the flap
(not shown). Interestingly, despite the error,
the sheet made it through the subsequent re-
valuation process without detection.

© Peter A. Scholle, 2000

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