1979, Green Throated Carib (Humming Bird), 35c multicolored, yellow color omitted, resulting in birds plumage appearing blue instead of green, bottom sheet margin single with partial Harrison and Sons Ltd imprint at bottom, full OG, NH, VF and rare, a common marginal single is included for comparison, ex-Stanley Gibbons, SG #631a, Pierron C.v. £500, Est. $300-$400 (Image)