KUT 1949 KGVI 10c Imperf Printers Trial Pair

1949-52 KGVI 10c Lake Naivasha IMPERF PLATE PROOF / PRINTER'S TRIAL: Pair on greenish buff paper with additional overrun of the alternate colour: ie the pair shows the 10c brown & grey and 10c black & green. Frames inverted to vignettes. Interesting piece presumably from the printer's working proofs, an unusual combination for these, the second such encountered by us. See additional image below for detail.