used  2d. deep full blue Plate II, a pair, Row 15, Nos. 1-2, with margins in places, each cancelled "C/21"; the left-hand stamp defective. R.P.S. Certificate (undated). Photo
used 2d. deep full blue Plate II, a pair, Row 15, Nos. 1-2, with margins in places, each cancelled "C/21"; the left-hand stamp defective. R.P.S. Certificate (undated). Photo

Details
used 2d. deep full blue Plate II, a pair, Row 15, Nos. 1-2, with margins in places, each cancelled "C/21"; the left-hand stamp defective. R.P.S. Certificate (undated). Photo