Abohart/Revstampman... I believe both of you may be right... It's not the printed stamp that abohart shows but the embossed stamp beind that says "AMERICA" at the top of the design I have seen several of similar design.

I'd love to get my hands on one (any version). Have any of you ever seen one come up for sale or recall how much it went for?
Even though I only collect and deal with US materials, my collection's first binder's initial section opens with a photo and description of Sir Hill and a Penny Black, Red and Blue as fitting tribute to the reformer and the Penny Black as the first regular postage stamp. I thought it may also be fitting to follow it with a tax stamp what would be emblematical of the spark for the "Boston Tea Party" and contributor to the American Revolution.