1987 Prehistoric Animals set (#1617-23) in imperf matched margin pairs, 10c Triceratops horiz. Crease through lettering at top, great Elephant, Fish, and Bird topicals, at most 20 sets of pairs can exist, NH, F-VF.Powered by SixBit's eCommerce Solution. The item "Nicaragua 1987 Prehistoric Animals set in imperf pairs" is in sale since Thursday, April 1, 2010. This item is in the category "Stamps\Latin America\Nicaragua". The seller is "george_alevizos" and is located in Topanga, California. This item can be shipped worldwide.