1871, Printed by Adolf Otto, Gustrow, Mecklenburg-Schwerin 3d. dull ultramarine block of four with central target cancellation in blue on thin paper, clear and distinct impressions. Colour Trials, Luff´s Plate ´N´, the left-hand vertical pair with some stains, otherwise fine and a very rare multiple. Endorsed in pencil ´Ex D Cohn, canc Otto´.