Rare ESL panel

I bought this old ESL panel, I can’t find any documentation any pictures online or any proof that this panel exists other than owning it. I had to mess around with the connections to figure out where everything connects. If I had to guess based on the components on the motherboard I would say its from the 70s or early 80s.

Ooh, never seen a panel like that one before!

The only ESL panel I know of is the 1500, do you know what the model of this panel is?

The model number ESL 101-00

Sorry, can’t seem to find anything on this panel either aside from the listing for the one you bought. I believe however that it says what manual to refer to on the right, if that helps any: “101-WD ISSUE”