2 d. G. R. I. On 20 penny imperial yacht, spacing of lines type II, variety \"inverted overprint\", setting 4, position 10, cancelled \"Rabaul\" on piece, so far only in 5 copies registered rarity - the existing piece comes from the collection marquess of Bute, expertises Holcombe and Scheller, Michel not even listed, SG. 19 j, Gibbs 19 d.