2s. to 50s., the study including 10s. sepia and green overprinted "WATERLOW & SONS LTD./SPECIMEN" perf. and imperf., a selection of perforation varieties with 2s., 3s. green on green, 10s. (2), 25s. chocolate imperf. between stamp and margin, also blind perfs, imprint pieces with code letters and cover (3) - one bearing 15s. blue on blue cancelled "Bangkok 11" (Phya Thai Palace). A fine assembly. (213)