"Why are our days numbered and not, say, lettered?" This observation came from Woody Allen back in the days when he thought it was okay to be funny. Numberal is an unusual typo because it adds a letter - most of the words in our list do the opposite. In this case, it creates something that looks like it should be a word. It is found in the 'D,' or low probability, section of Typographical letters in library databases at http://faculty.quinnipiac.edu/libraries/tballard/typoscomplete.html, meaning that it was found at least twice but no more than seven times in OhioLINK at the time of its discovery. Indeed, there were only two hits for the word today in OhioLINK, and 9 in WorldCat.
Today's photo shows a group of New York City firemen on the West Side talking shop, or possibly baseball. See how many times you can find the number 21 here. The original can be found at http://www.pbase.com/terryballard/image/44269664.