inverted), 4c. on 6c. (5 including one without gum, one perf. 14½-15 and one used) and 10c. on 12c. (8, seven without gum including a block of four). S.G. 186-188, £726" /> 1916 (Feb.) 2c. on 3c. (4, two used including one on piece showing<I> "s"</I> inverted), 4c. on 6c. (5 including one without gum, one perf. 14½-15 and one used) and 10c. on 12c. (8, seven without gum including a block of four). S.G. 186-188, £726 | Christie's