1912 ½D ROYAL CYPHER INVERTED WATERMARK USED BLOCK OF 18. (SG351Wi). Used block of EIGHTEEN 1912 ½d royal cypher INVERTED WATERMARK FROM SHEET FORMAT (SG 351Wi), London parcel post cancellations. A very scarce piece from sheet format - most inverted watermarks are from booklet format. (Ref 60351).
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