Barstow Stove Company operated out of Providence, RI (Water St) from the 1850s until 1929-30 or so. They are better known for their stoves, but even there, they were a small/regional foundry, so their stoves aren't that common. They also did business as Bay State Stoves (or acquired the name, I don't remember exactly).
To the OP...nice find! I've never seen a piece like it either. Jealous!