"Chelmsford" and "London" completed in manuscript); some faults on reverse and area of soiling at lower-right but not detracting. Very rare. Photo" /> cover 1873 (3 Oct.) envelope to London bearing 1864-79 1d. tied by black oval of bars with "R.L.O." in centre, showing superb strike of the black "POSTED AT ...... UNDER/COVER TO THE POSTMASTER OF...." (with details of<I> "Chelmsford"</I> and<I> "London"</I> completed in manuscript); some faults on reverse and area of soiling at lower-right but not detracting. Very rare. Photo | Christie's