<a href="https://en.wikipedia.org/wiki/ambigram" class="extiw" title="en:ambigram">Ambigram</a> <b>« M. H. Hill », « Bet », « bung », « maw », « pad », « hay », « dip »</b>, by B. R. Bligh and Clarence Williams, published in September 1908 in <a href="https://en.wikipedia.org/wiki/The_Strand_Magazine" class="extiw" title="en:The Strand Magazine"><i>The Strand Magazine</i></a>. 180° rotational symmetry. Text says: "<i>MORE REVERSIBLE WORDS. Seeing the reversible word « chump » among your « curiosities », I am sending you a name, « W. H. Hill », which, when written in the style shown, reads the same when reversed. Surely this is the only name possessing so convenient a peculiarity. - Mr. B. R. Bligh, 2, Porchester Mews, Bayswater, W. In writing the word « Bet » so that it reads the same when upside down, I have simply written the letter B twice – once with the paper inverted. Three letters and one word are thus twice repeated. Possibly B is the only letter of the alphabet that will produce such an interesting anomaly. I also send you five more examples of reversible words. - Mr. Clarence Williams, 2016, Bright Street, Carbrook, Sheffield.</i>"
B. R. Bligh and Clarence Williams
<a rel="nofollow" class="external text" href="https://books.google.la/books?ei=lwlNUPf4OYrf0gGni4CgAg&amp;redir_esc=y&amp;id=45MkAQAAIAAJ&amp;dq=strand+%22are+there+others%22&amp;pg=PA117&amp;lpg=PA117&amp;sig=ACfU3U0GzAnMaawdRxa0DrNzH8YGp15FJQ&amp;focus=searchwithinvolume&amp;q=strand+more+reversible+words">The Strand Magazine September 1908, Volume 36, page 359</a>