This Ithaca manufactured black synthtic buttplate with serrated lines and the words "Ithaca Gun Co.Inc." printed below the horizontal lines is for the model M-66 Supersingle lever action single barrel shotgun and is in very good condition with light wear and handling marks.  This butt plate measures approximately 4 5/8" tall by 1 7/16" wide.  (file photo)

Note: Ithaca model M-66 Supersingle lever action single barrel shotguns with the following serial numbers have been observed with this part:

12 Gauge: 17010 & 30958

20 Gauge: