This gentleman came froma flea market but at some point in his life he was sitting at either 145 Tremont Street or 203 Washington Street in Boston.
I'm not sure what a "Cabinet Portrait" means but he sure is interesting looking. Like he's thinking about something important while waiting for the shutter to finish it's business.
Whoever he may have been, he's worth remembering as he probably was somone with important things to think about having most likely been successful to some degree in his chosen field.
Now days we snap shots and seconds later those shots are on the internet and being viewed on the other side of the world. In this gentleman's day, a print like this would not have been an inexpensive thing to have made.