Great Britain 1840 2d Blue Plate 1, SG5 Australian States stamps very rare in this quality

very rare in this quality

set of two bottom left hand corner marginal cylinder blocks

The stamp designs depict the following:

The R in Henry's signature signifies the words

Great Britain 1840 2d Blue Plate 1, SG5 Australian States stamps very rare in this qualityGreat Britain 1840 2d Blue Plate 1, SG5. A very fine used closed to large four margin example lettered 'BI', neatly tied to an entire envelope by a crisp red Maltese Cross. Sent from Plymouth to Cambridge and backstamped by a Plymouth dispatch circular date stamp for JY. 26. 1840. London transit circular date stamp for JY. 27. 1840. and a Cambridge arrival circular date stamp for JY. 28. 1840. The contents of the enclosed letter regards the family