cover 1901 (Oct) envelope to Amsterdam bearing 2a. 6p. tied by "ADEN" segmented c.d.s. and showing, on reverse, a fine strike of the extremely rare boxed "THE PERIM COAL CO,/LIMITED/PERIM ISLAND" h.s. in violet with "in 13.10.01" and "out "15.10.01" in manuscript, very slightly overstruck by arrival c.d.s. A splended exhibition item. Photo