I believe this is by Boston Sandwich and in fine original condition. About 7 1/2" by 4 1/4". White overlay cut back as shown with heart design, and diamond cut surround within the overall decoration. Fine quality and condition. The top rim is polished as is the base. Has rounded base and wider shape as American pieces do. A fine and unusual piece.
Antique Boston Sandwich Heart White Overlay Cut to Cranberry Glass Flask