Eric Gill | Notes on Postage Stamps, a 24 page book from the Kat Ran Press contains 56 full-color illustrations and an essay by Gill on his philatelic ideas and opinions. The portraits in the 2 stamps above were designed by Edmund Dulac with the lettering, crown and small ornaments by Eric Gill. This book is available for purchase from Kat Ran Press. They also keep a wonderful archive listed here of other distinguished type designers who have created postage stamps and other assorted philatelic materials. All of their names are clickable here.
:: From mrussem's Flickrsteam.