The head plate of this printing is an almost exact match to Gibbons's bright blue, while the duty plate colour is royal blue.
I have two mint type A's and two type B's, one of which is used, and has been cancelled with what appears to be an 8-bar oval obliterator.
On this printing the head plate and the duty plate are closest to what Gibbons's cobalt blue would be if it were deeper. A similar shade is found on the very late printings made after 1899, but the degree of plate wear showing on this example is too advanced for it to have been from the new plates that appear to have been used to print the last printings. I have only the one mint example shown in the scan above.
The head plate of this printing is closest to a very pale version of the dull ultramarine, while t…