The earliest guestbook, which covers the 1870’s, has a number of truly delightful sketches in it.  This one, of the author, is a very simple one.  ‘The author’ by the way remains unidentified, we simply can’t figure out who signs with a little bird as his signature, except that he (presumably he, based on this sketch) is responsible for many of the amusing caricatures.  The initials appear to be ‘del’ but that doesn’t match either.  I am sure, by process of elimination I will figure it out, when I get around to it.