cover 1861 (25 Feb.) entire to St. Lucia, bearing 1855 imperf 4d. brownish red (defective at foot) and 1860 no wmk. pin-perf 12½ 1d. blue, both clearly tied by "1" barred numeral and showing red crayon "4" with, on reverse, despatch and arrival c.d.s.; the entire with some light crease and small fault at foot. A major rarity and almost certainly an unique mixed issue franking. B.P.A. Certificate (1993). S.G. 5, 16a. Photo