Canada O9a

1949-1950 Fifty cent Lumbering "O.H.M.S." overprint, a fresh, well centered mint lower left Plate 1 block showing the missing period after "S" variety (Pos. 47) on the lower right stamp, top pair lightly hinged, the lower pair which includes the variety is never hinged, Very Fine  (Unitrade O9a; catalogue value $2,400)