I am not a spool collector but I came across a few of these chocolate colored spool last week, and I can not identify who manufactured these insulators. As you can see from the pic there is a raised embossed "H" within what I call the "Union Pacific Logo." The dimensions are 3" wide X 2 3/4" in height, with a 1" pin hole. I believe it to be manufactured around the 1940's. I know it is not a Hartford Faience Company spool, can I get some help identifying this common spool?