Scheidig, Harvard Historical
S with three filled in circles and a T, X-bridge, pin in slot sidearms, with small circle finials, American Optical
Possibly ES on an early example
Leaves with a star on the top, a V with a dot above
Leaves above a pineapple design
Goss Dorfer, American Optical
GFS in a shield-like cartuche
S in a shield-like cartuche
Bitterman, Old Sturbridge Village
Peacock P, Rare unknown maker's mark, brass spectacles, circa 1815, Duxbury Rural & Historical Society