This is a new DELCO REMY (GM) headlight signal switch .   It is an OEM NOS DELCO REMY (GM) switch, not an aftermarket replacement.  The part number is 1995110 (D1551)  it is in group 8 of the INTERNATIONAL parts catalogs. It is unused and has been on my warehouse shelf since it was purchased from GM. The part  is stamped 110  Delco Remy on the bakelite.  Some of the applications are listed in the photos.

According to Delco  It  fits:  INTERNATIONAL TRUCK 1967-1970

                                          

The part number may have been later superseded to fit other models, but this is the only correct application in the original listings. I am selling more than one of these items, so the picture shown may not be the item you receive. All are NOS OEM items have been stored in ideal warehouse conditions. There are sometimes minor packaging differences depending on when the part was shipped from the manufacturer.