I may or may not have “invented” it 20+ years ago. The spread would have been out of Chicago so by now I wouldn’t be surprised if it made it to both US coasts. 
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I bought some boards like these and I love the smell of the phenolic board material with what can only be described as copper leaf for traces. It makes me nostalgic for those old walkie-talkies (what we called kids two way radios) that I used to have. It works fine but it is more brittle than fiberglass.
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FUNGUE MOD?
Can we see the other (copper) side?
That’s “Funque Mod” 
. The copper side looks identical, except it doesn’t have the lines on the silkscreen (which you can just barely make out). When I took French in 8th and 9th grade, I was fascinated by the fact that you can replace a “K” with “QUE” and it sounds the same. In the late nineties, I released a few records on my own “Funque Droppings” label and “Funque” has just stuck somehow.
EDIT: Here’s a closer look. Top side left, bottom side right. You may have to zoom in to see the difference:
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Some of them look really old. Or are they?
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Well I was thinking “is that really a 741 op amp?” They used to be popular in the seventies.
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Shhhh! Don’t mention the 741! The younguns don’t need to know how good we had it. 
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They are old, especially the ones with the TO-99 layouts, late 70ies i think. i still don’t know what to do with them.
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They would make great touch pads. Crackle synths, tiny r2r panels using smd, solar panels, art work, cool panels, patch bays… come on guys, jump in!
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Or…
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There’s three of them over here
Here’s a closeup:
The phone didn’t exactly do a good job with the text, but it does say UA741 on it.
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