Great Britain 1841 1d Rainbow Trial (State 3), SGDP20 Brunei stamps vertical interpane block of 4

vertical interpane block of 4 from November 1924 printing using combined plates '7' (upper) and '12' (lower)

Type 13 Surcharge

generating $677m at the box office

but the change was not approved and the greater part of the stock was destroyed

VARIETY WATERMARK SIDEWAYS

Great Britain 1841 1d Rainbow Trial (State 3), SGDP20 Brunei stamps vertical interpane block of 4Great Britain 1841 1d Rainbow Trial (State 3), SGDP20. A superb unused four margin top marginal example printed on white wove paper in deep green. A scarce specialised philatelic item of early GB postal history. These trials were produced to test various combinations of stamp and cancellation ink. It has long been considered that the voiding of the corners was achieved by filling the grooves of the plate with wax. However, recent research has brought