5 Kr as well single stamp and pair 10 Kr double eagle as mixed franking on registered special delivery letter from SCHLAN 7 / 10 88 to the mayoralty in Prague, with black additional cancellation one-line cancel RNr and handwritten number 183 as well express order, right 10 Kr stamp of the pairs with corner perforation defect top right, envelope horizontal folded, photo expertize Ferchenbauer VUEB "untreated superb item