For Mailman (V Pol'zu Pochtaliona). 1909, red overprint on revenue stamp of 15k blue and rose, block of four, top stamps without overprint, while bottom ones bearing double overprint (one inverted) due to amazing overprint shift, full OG, NH (bottom stamps) or LH, VF and extremely rare, according to our records the only block of four and the vertical pair of this error are known, the last time it was sold in our Auction #73 for $5,750 including commission, Raritan Stamps guarantee, SC #J1, Est. $5,000-$6,000 (Image)