Flush Mount Wrought Iron 9 1/4" Door Slide Bolt, 600-898

A flush mount semi-mortise slide door bolt, manufactured circa 1850, in plain wrought iron.   Bolt is mounted as semi-mortise so that when it is in place the plate is flush with the door surface.  Bolt plate measures 9 1/4" high x 1 1/4" wide and requires a 5/8" surface mortise   The brass knob operator is 3/4" diameter and the bolt throws 3/4".  Keeper measures 1 1/4" x 1 1/2".  This type of bolt was used either as the top bolt or bottom bolt and often as both upper and lower bolts together.