Identify this Atari PCB?

Straker

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There is a Pat. No 3793483 on the board which is a Bushnell patent so I am assuming this is Atari. Copyright date of 1974. Other markings are RT20-B and the board has the numbers 001791 on the part side and 001792 on the solder side. I don't have a camera to take a picture but it looks like similar Atari PCB's of the same time period.
 
Yeah looks like it is probably the main board from the number(Gran Trak 20 (RT20 main) A001791) he has on that site. I wish he had a pictue of the main board. The board he has pictured isn't the one I have. I'll have to put a post in the selling forum to see if anybody wants this.
 
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