2c dark blue on pink 'Seebeck' postal stationery card (H&G 32) datedlined 'Corinto 15.1.97' used with light CORINTO cds. Addressed to MANAGUA with duplex arrival cds with bottom part of cds cancel and circular duplex section completely blank dated JAN 16 1896 in error struck clearly on front. The card has some slight water staining on right hand side but otherwise a rare and unrecorded marking. Note that this card and postmark featured in an article in Nicaro Vol 26 No.4, October 2017 a copy of which accompanies.