Colour proof of 4 sk. 1854 plate IV, block of six with full left sheet margin, pos. 41-42 / 51-52 / 61-62, without gum and burelage IIb printed in blue colour and dotted spandrels. The two stamps above with dotted spandrels and the lower four stamps with empty spandrels - a very rare example the upper and lower half sheet. In the Postal Museum the printing plate has empty spandrels in the lower half sheet of 50 stamps. Plate IV has been used for the last 1854 printing IV delivered from 16 June 1859. It is not known why this plate has had the spandrels removed, but perhaps experiments were made for a new design without spandrels and trials for another burelage colour since the yellow one that were used were sometimes almost invisible.