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Can someone confirm these would be gold finger boards? They have small boards soldered onto the main board, which makes me question it.

I am thinking that may go High Telecom.
My evaluations are my own opinion
MY EVALUATIONS ARE MY OWN OPINION.

I imagined if all those boards were layed flat. That seemed sufficient for IC count. And then worked in the clean and no junk factor. Got the gold fingers. All I thought then was. Why not High Telecom?
As a sidenote. That could almost pass for a giant RAM board. It indeed may be some type of memory.
Here is a clue. A rock solid observation. Note. A bank of 8 small boards close to the fingers. 8 left. 8 right. 16. That is typical data bus or address numbers. ALSO. Strikenly. There are 16 of those small boards mounted on the main board. Again 16. Typical data or address numbers. Which relate directly to communication lines for a microprocessor and it's PIA chip sets etc.
I can't get a part number from photograph. But that board smells heavily of a memory board of some type. Everything is symetrical. The labeling of each small board with a number. The label OUT. It's just a guess.
Oh. My mother had a rotary phone. I remember using it many times.
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My evaluations are my own opinion