GRENADA 1970 50C PIRATES THERMOGRAPHED COLOUR TRIAL
50c Pirates composite colour trial, on chalk-surfaced, gummed paper measuring circa 52 x 58 mm, combining typographed background in brown with thermographed figure in blue. Ex Bradbury Wilkinson. Very scarce. Generally fresh and fine. SG369var; SC347var
Note: Bradbury Wilkinson experimented with thermography in an attempt to cut escalating engraving costs, but the trial was short-lived as the depth of shading offered wasn't deemed acceptable
