This site the starting point for the penny black plating site, and the missing imprimatur database.

The Mulready Group on Yahoo!
Plating the Penny Black <--This is the largest archive of Penny Black images anywhere!
Missing Imprimatur Database
The Missing Imprimatur Group on Yahoo!
A Friendly trustworthy dealer in fine Line Engraved material

This site is a free site, but I would appreciate donations to help cover the costs!