This one is in via Thesis Audio Service who had the following to say:
"I came across this very rare module in a 1968 Moog IIIp that we are restoring for a client. It is a model 981 four channel mixer which I can find very little info about. It appears in the classic Wendy Carlos modular picture and in some Max Brand pictures. There is no mention of it in any of my Moog archive literature or service documents. I have included the schematic that I derived from it. It is an AC coupled mixer for audio. All of the IIIp system pictures that you find show a multiple panel in it's location in the system. The IIIp that we have is dated 1968, but this module is dated 1967. It's a bit of a Moog unicorn, possibly built by the master's hands himself."
I believe this is the first Moog Model 981 module to be featured on the site. You can see the Model number designated as 981 in the image below. The serial number is 1002 and the date is NOV 10 1967. R.A. MOOG CO. TRUMANSBURG N.Y. is on the label. You can find a circuit diagram below as well.
Thesis Audio Service also sent in the rare Moog Model 903 White Sound Source posted here.
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