used 1910-13, postmark range on Double Heads (66 stamps), including Chilanga, Colleen Bawn, Gwaii, Indiva, Siding (very rare), Inyanga (on 4d.), Kawambwa, Mtoko (on 6d. with printer's mark), Peggy Mine, Petauke (squared circle), Raylton (on 4d.), Shamrock M, Sibali and Simbabwe; values to 1/-, mostly fine