What is pictured is not a Tek 4317.
It is a HD/floppy expansion box or maybe a Tek 4404 with a keyboard
mouse and Monitor. The monitor looks like the standard 19" RGB sync on
green used with the 41XX terminals.
I have a Tek 431X, not sure what particular model, in storage and it
looks different, as does the referenced Tektronix page.
I also have a 4404 that looks a lot like the one in the above picture.
I have the Smalltalk software for the 4404 and 4406, which I am
forwarding on to Jerry in Seattle for replication. He is trying to get
a 4404 up and running.
Paxton
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Paxton Hoag
Astoria, OR
USA