Proof Block of Four 1915-29 Perkins, Bacon proofs, comprising 1½d., 2d., 2½d., 4d., 4½d., 6d., 7½d., 9d. and 1/- blocks of four, all in black on wove paper watermarked "SPECIAL POSTAGE PAPER LONDON", fine

細節
Proof Block of Four 1915-29 Perkins, Bacon proofs, comprising 1½d., 2d., 2½d., 4d., 4½d., 6d., 7½d., 9d. and 1/- blocks of four, all in black on wove paper watermarked "SPECIAL POSTAGE PAPER LONDON", fine