Printed in sheets of 100 stamps, for use on official mail to foreign countries.
At least five counterfeits known.
Exist on thin paper with sheet watermark "AMERICAN LINEN BOND".
On genuine stamps, the letters "f" and "i" in "Oficial" are joined by the crossbar of the "f".
The frame ornaments are separated at intervals by small spaces. The lance ending points in corner ornaments are clear and sharp.
Variety: horizontal pair, imperforate between (SN O5a)
