used 2a. green horizontal strip of four, the first three stamps showing portions of the "STAMP OFFICE" 1a. watermark, with mainly good margins (tiny nicks in margins at left and right); a fine and scarce multiple

Details
used 2a. green horizontal strip of four, the first three stamps showing portions of the "STAMP OFFICE" 1a. watermark, with mainly good margins (tiny nicks in margins at left and right); a fine and scarce multiple