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Gibson circuit ID?

Hi guys,can someone ID this circuit for me?it's fitted in my Hoyer EB3 bass,and i was told it's been in there since the bass was new,it's early 70's,i wonder if it's the same circuit fitted to maybe a Ripper or Grabber bass?because it's not like any EB3 circuit iv'e seen,but as you can see it does have Gibson written on it,along with 001,thanks,i hope i can find out.
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