The artist was Frederick Waddy and the image first appeared in the magazine
`Once a Week' for Dec 14, 1872.

It was used in the small broadside handbill advertising Twain's Sandwich
Island lecture at the Brooklyn Academy of Music on Feb 7, 1873. (see MT
Speaking, p. 650).

There is a good discussion of this image in Frear, MT & Hawaii, pp. 188-89.

Paine included it in his 1912 bio of Twain, misdating it ca. 1866-8 (or late
60s anyway) which has led to it being reproduced several times since with
the incorrect date attached.

Perhaps the very best use of this image was when some bookseller reduced
this image down to about an inch in size and reproduced it about 30 times,
creating a heard of Twains leap-frogging across the front cover of one of
his many splendid Twain catalogues, but modesty does not permit me to reveal
his name.

Kevin Mac Donnell
Austin TX