Most all of the differences can be fixed except the overall height.
I looked at the port and it can be modified to be full width. Probably it was cut with a router which would not cut all the way to the edge.
There's nothing back there to get in the way so a flat saw would easily cut it away.
One way or the other I can trim the front to be 1-1/4 instead of 1-1/2. Either by removing it or routing by 1/4"
Not that I am trying to pass this off as the genuine deal, but I don't think I want to throw it away.
I just won't put a Sunn tag on it.
Or maybe I can put a Sunn tag on it and then in small letters below write "Work Alike"
The little tag on the front you can see says BandStand Music Tacoma. So I wrote to them as they are still in business. (The tag is very old according to the phone number) I got an answer back from the son of the original owner. He said he didn't know but would ask his dad about it. It might be interesting