vintage Altec Lansing circuit board ID

Hi All,
 Not sure if this is the right place for this post, however I will start here.

 I acquired a bunch of service parts from an Altec Lansing dealer that retired. He had been a dealer since about 1968. I am currently trying to identify an unused circuit board that was in an Altec box marked14677 -  circuit board only.  I have looked everywhere for any kind of info for this. The actual board has the number 14624-3 etched in it.
This was in a box of parts for a 352A mixer/amp 
Any guesses out there?
I can send a picture upon request>

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