From Dave Brigham:
The Circle Supply Company moved out of this location in Watertown, Mass., to a building about half a mile away. At one time, this factory housed the Textile Thread Company, which made cotton and linen threads and twines.
(Former Circle Supply Co., Watertown, Mass.)
This building is in the section of Watertown I've come to refer to as The Lost City. For more about this area, see my recent post, "Rebuilding the Lost City: SECOND UPDATE."