unused Block Larger Than four 10c Pale Ultramarine special delivery (E10), T. plate no. 6043 block of six, five stamps never hinged, extensive perf. strengthening in both vertical rows of perfs. only in the selvage, intensity of color varies slightly from left to right (transitional shade), otherwise fine-very fine (will yield two really exceptional stamps), a rare plate no. block, Scott retail $4,750.00 photo