Here are some more vintage Allen & Ginter's from my collection. These are 8 out of the 10 boxers in the set- or pugilist as it says on the back. In the late 19th Century boxing was extremely popular, so it's not a surprise that they comprise a large part of the set.
BTW, here is what the back of the cards look like.(Checklist Pic above from BaseballCardsLive)