Since August 1991, collectors of modern US stamps have known of two distinct types of the intaglio printed Mount Rushmore coil stamp (Scott 2523, Krause-Minkus 945).

Thanks to both Ken Lawrence and the Bureau Issues Association for permission to use this copyright six page article on my web site. 

Want a postally used example of a coated (Lenz) paper Rushmore?  Click here to send me an e-mail with your name/address and a cover will soon be in the mail to you.