The only markings are "HOPES" and "Jamestown NY" on the top and "L.H." on the underside. There are no other numbers or letters anywhere.
Tom from SWISCO responded:
June 26, 2017
This is a very old operator. I don't know if we'll have an exact match, but our 39-354 may work as a replacement. I think this might be a modern version of your old part. See what you think.