cover 1867, 1869 and 1872 envelopes addressed to France or Switzerland, bearing 5d., 4d. and 3d. frankings respectively comprising 1864-79 1d. plates, each showing black handstruck "INSUFFICIENTLY/STAMPED" or "INSUFFICIENTLY/PREPAID" and each with a red "PD" marking cancelled by London numeral or dumb obliterator; an attractive trio