cover 1866 (26 July) blue Returned Letter Branch OHMS envelope from St. Georges to Brussels, various rate computations and showing a superb strike of the straight line "REGISTERED" h.s. with St. Georges P5 c.d.s. below, "Crown/REGISTERED", London Registered oval d.s. and "REGISTERED/PD" duplex d.s, all three in red; two adhesives have been removed though an interesting cover