o. 21" Glasgow District Office marking in the same colour; the address panel with small internal hole but otherwise fine. Thought to be previously unrecorded on an 1841 1d. Photo" /> cover -- 1841 1d. plate 20, PC (double letter C), good to enormous margins (portion of adjoining stamp at left), on entire letter from Glasgow to Irvine dated 17 March 1842, tied by light strike of the purple Maltese Cross, the reverse showing framed "N<V>o. 21" Glasgow District Office marking in the same colour; the address panel with small internal hole but otherwise fine. Thought to be previously unrecorded on an 1841 1d. Photo | Christie's