Gambia 1935 Silver Jubilee 1s slate and purple, variety, SG146/aGambia 1935 Silver Jubilee 1s slate and purple, lower left corner block of 4 from vignette plate "1", showing variety "Extra flagstaff" on R9 1, SG146 a. A fine mint positional block of four with original gum. Minor bends, but most importantly the high value printing variety is very fine. A lovely looking block with very fresh appearance. A rare printing variety. The total printing was only 789 sheets, probably from six vignette plates. Stanley