Martin Handcraft from 1923.  Sell as is.  The good news is that it's a low pitch horn, which is playable with modern ensemble tuning and it looks undamaged.  The bad news is that it is antiquated from a keywork standpoint (no front F key), which makes it a horn for historical horn buffs only.  The unknowns are mechanical wear and whether it's a tenor or a c-melody.  C-melody horns are less valuable.  Check the length of the body tube to the bottom of the bow.  If it's close to 25 inches it is a c-melody.  If it's close to 30 inches it's a tenor.