Cuba 1882 - (EDIFIL 13Ec) (Higgings & Gage 15) Double Reply Error Card.
2c + 2c unused, folded double reply ERROR card. This is a plate composition error in which, when you look at the MESSAGE card, the text is noticeably displaced to the left and the indicium is at the upper right corner (upper left corner on the normal card). When you look at the REPLY card, the text is displaced to the right and the indicium is located at the upper left corner (upper right corner on the normal card). Furthermore, this card is the "broken U of Ultramar on the Message card variety"
Very interesting and unusual. Listed in EDIFIL and priced at € 156.- (US $200.00) for a folded card.