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SG628a 1961 (18 September).  CEPT.

10d Multicoloured.  Pale green Omitted.

The Unique Right Sheet Marginal Vertical Strip Of Four, Third Stamp MAJOR ERROR "Pale Green (from doves) Omitted". Adjoining Stamps Partially So. Post Office Fresh Unmounted Mint. A Magnificent Piece Of GB Philately with just 6 examples of the error possible.

David Brandon Certificate.

Unique and Stunning.  THE FINEST PIECE EXTANT.