Hawaii, 1878, 6¢ Bluish Green, tied by segmented target cancel on 1872 cover with John Neill, Machinist, Lock and Gun Smith corner card, reverse with allover six panel merchant advertisement - one with illustrated Pocket Watch, to San Francisco with red "G.P.O. Honolulu, Paid All, Nov 22" and "San Francisco, Paid All, Dec 2" cds, Very Fine, ex-Norbeck, Peitsch, Twigg-Smith. Scott No. 33a  Estimate $2,000 - 3,000. ONE OF THE MOST STRIKING OF THE FEW BILLBOARD ADVERTISING COVERS KNOWN FROM HAWAII. The two examples of this John Neil advertising cover with the billboard ad on reverse we have recorded:1. 1873 Jul. 31, Honolulu to Samuel Hill, San Francisco Cal. bearing 2c #31 strip of three, ex-Gary Peters.2. Nov. 21, Honolulu to Samuel Hill, San Francisco Cal. bearing 6c #33, ex-Norbeck, Pietsch, Twigg-Smith (real. $4,025), the cover offered here. $0 (Image)