From penny post to $8 million as world's first stamp heads for auction | Reuters
1840-1d-one-penny-black-stamp-pennyblack - WANTED VINTAGE CORGI, DINKY MODEL TOYS, ALSO HORNBY 00 0 GAUGE TRAINS, R C MODEL AIRCRAFT, STEAM ENGINES LOCOMOTIVES. ANY VINTAGE MODEL COLLECTIONS CALL KEITH TODAY 02476 338641 07747020513
The Penny Black: A Stamp Collector's Holy Grail - Arts & Collections
World's first stamp to go on sale at auction - and it could fetch $8.25million | The Sun
What is a Penny Black stamp? 7 of the world's most valuable stamps - and the stories behind them - Mirror Online
The 175th Anniversary of the Penny Black (2015) : Collect GB Stamps