cover 1894 (30 May), substantial yellow cover used from Lamu to Zanzibar, bearing on the reverse unoverprinted India 2a., 4a. pair with "LAMU/A/MY 30/94" single circle datestamps and backstamped Zanzibar upon arrival; rare and a quadruple rate. Illustrated on page 12 of "India Used Abroad" by Jal Cooper. Photo