You may like to know that businesses have been using Clemens' name/image
since early 1864, which is quite remarkable considering the earliest known
Sam Clemens as Mark Twain piece dates to 1863.  Coincidentally, I just had
an article published that addressed the historical record of such uses of
Twain's image titled, "Twain Makes His Mark As Ephemera Giant" in the
current issue of "Ephemera News," published by the Ephemera Society of
America. My article also provides information about some rare &/or
one-of-a-kind Mark Twain related ephemera as well, including the death
certificate that was once attached to his coffin being united with his
manuscript on immortality (and in a very uncanny manner), and info about the
16 first editions of A Murder, A Mystery, & A Marriage. The  Ephemera
Society website is www.ephemerasociety.org .

Twainiac Bob
Hilliard, OH