I do believe that you are correct. I didn't pay enough attention to that the first time around; I simply dismissed it as a covering for material underneath and didn't notice the cuts.The scratches could be laser trim cuts. They look fairly precise and repeated.
There's an extra leg between each resistor, what could those be for? They're connected up so they must be for something...
There are likely resistors on the back side as well.
This looks exactly like hybrid circuits that I have worked with--the thick film resistor element is screened on to an alumina substrate and overcoated with a glass frit that is then fired to seal it--then it is laser trimmed to get exact resistance--the laser is so hot that it seals the edges of the cut
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by Jake Hertz
by Jake Hertz