(7 May) cover to Johannesburg, franked 1½d cancelled by special AIR POST EXHIBITION/LONDON handstamp, also on obverse is Air Post Exhibition label with selvedge. Fine. (Start Price = £22.40)
re-engraved 2s6d in vertical pairs (different shades) and single, perfin respectively E/LTD, M & H and SUTTON/READING, plus 5s (2) perfin JA/E and SUTTON READING, used. (7) (Start Price = £20.00)