original c. 1900-10 american exterior residential entrance door "letters" mail slot designed and fabricated by the russell & erwin mfg. co., new britain, ct. the ornamental cast brass hinged flap mail slot is fashioned in the popular "chatham" pattern, introduced around 1900. refinished and clear-coated surface patina. excellent working condition. measures 8 3/4 x 2 3/4 inches.