1916 (7 May) 1s mauve on thin horizontally laid typewritten (carbon), unused COMPLETE SHEET OF SIXTEEN (4x4) from plate 5 with full margins on three sides (trimmed at foot as usual with this reduced format), showing plate number '5' at upper left, error 'Postge' for 'Postage' on pos. 3, and varieties 'Semi-colons at left' (pos. 5 and 9), 'L in LONG doubled' (pos. 15) and 'extra colon at right' (pos. 4), with complete 'Silver Linen' papermaker's wmk on third row. Horizontal crease through third row, and minor corner crease just affecting pos. 16, otherwise very fine and fresh. A spectacular and unique exhibition item, being the only surviving sheet of the 1s mauve, and including one of the two recorded examples of the 'Postge' error (the other being a single). Ex 'Mountrobeck' (CRL 1/6/94, lot 104). [Production of the 1s mauve comprised 228 stamps (nine sheets of 20, from plates 1-4, and three sheets of 16 from plate 5, of which this is one), but 87 remainders were destroyed, giving an issue figure of 141, from which 100 unused and 4 used have been recorded]. (cat £9125++).