used  -- 4d. maroon, variety mixed perfs. with a row of perf. 10 inside design at top, lightly cancelled with part "N.N" duplex; a very rare stamp of which only two examples are believed to exist. C.P. C4b (Y). Photo
used -- 4d. maroon, variety mixed perfs. with a row of perf. 10 inside design at top, lightly cancelled with part "N.N" duplex; a very rare stamp of which only two examples are believed to exist. C.P. C4b (Y). Photo

Details
used -- 4d. maroon, variety mixed perfs. with a row of perf. 10 inside design at top, lightly cancelled with part "N.N" duplex; a very rare stamp of which only two examples are believed to exist. C.P. C4b (Y). Photo