Sadly, despite being competent in holding pipes and magnifying lens, the use of a pen proved too much, thus no autograph could be traced.
So, we did the next best thing and got hold of the voice actors instead.
In 1953 for United Television, the legendary voice actors Paul Frees and Daws Butler voiced chimpanzees dressed in Holmes and Watson outfits in a series of 13 five minute sketches.
It was called "Professor Lightfoot and Dr. Twiddle", with Frees voicing Professor Lightfoot and Butler voicing Dr. Twiddle. The "Case of Hypnosis" episode of "Professor Lightfoot and Dr. Twiddle" can be viewed on the DVD set “Sherlock Holmes Archive Collection” Volume II.
Paul Frees also voiced Boris Badenov as Hemlock Soames with June Foray voicing Natasha Fatale as Dr. Watkins in some 1960 TV episodes of the animated "Rocky and his Friends" series.
Paul Frees would also voice Sherlock Holmes with Jim Backus as Mr. Magoo in Dr. Watson's role in "Mr. Magoo Man of Mystery" (1964) & "Mr. Magoo's Sherlock Holmes" (1965).