cover 1893 (12 May), 2a. registered envelope, size "J" and "R" over "E", used from Mombasa and addressed to Colonel Crawley, Assistant Adjutant General Allahabad, India, bearing 2a. vermilion (2) and 3a. black on dull red (2) tied by "MOMBASA/A/MY 12/93" squared circle cancellations; envelope, with slight staining, backstamped upon arrival; quadruple 2½a. rate and 2 annas registration