Republic of Niger issued set of air mail stamps
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On November 23, 1972, the Republic of Niger issued a set of air mail stamps in honor of Jean de la Fontaine, including the three specimens pictured below, each on a first day cover and each in a numbered series of 2000. $30 from Alexandre Przopiorski, August, '99.
The stamps in each case seem to include three colors, one of which is black and one brown. A strong brown foreground stands against a sketchier blue or green background. Are there more in the series?