In 1906, when this card was mailed from Chicago at 7 PM on 13th September, it arrived at its city of destination (Hudson, Massachusetts) on 15th September at 3 PM.  We know this, of course, because postmarks for both places are there, along with the stamp.  Is there a lesson to be learned here?  Probably.  Do we know what it is?  No.  Undivided back card.  Grade: 1