cover 1905 envelope registered from Grand Cayman to U.S.A. bearing 1905 1d. and 6d.; 1911 envelope registered from Cayman Brac to Canada with 1908 3d., both showing "JAMAICA/REGISTERED" oval transit d.s., and 1913 envelope registered from Georgetown to U.S.A. bearing 1908 3d. pair and with Grand Cayman registration label