Great Britain 1840 1d Rainbow trial (State 3), SGDP20bGreat Britain 1840 1d Rainbow trial (State 3), SGDP20b. A very fine four margin imperforate example printed in deep blue on white wove paper. To produce State 3 each of the impressions was re entered (probably using the roller with the blank upper corners as evidenced by the new thinning of the north west corner star). The corners were again voided, but more carefully and are generally more uniform in appearance than seen in State 2. GB Specialised