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This is a keypad PCBD from a '70s era calculator. Yes, keypad!
The picture doesn't really show it, but the traces are all a rich, dull gold color.
I may keep it, not certain.
If I decide to scrap it, what class?

Thank you.

Bump...

Gold/nickel traces. Peripheral

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

Thanks Lost. I knew it wasn’t all gold trace. I just never know what lays beneath, especially on these old ones. Not to mention when you replied to one of my posts stating palladium was also used. Interesting stuff indeed!

Also, that keypad was the oddest style I’ve seen so far; spaghetti vs nice circles broken in half.

That’s another common alloy of the era.
Works out to be just under 8kt most of the time. 6-8 on average.Granted there’s not enough to even considered refining (for the few that ask from time to time) but it is enough to bump a midgrade trace board to peripheral.
Break into some 8-bit computers of late 70s video game systems you’ll see a lot of this. Texas Instruments and Coleco are common enough for this type of tracing.
It’s almost identical to the the TI computer number pads I’ve sent in...at peripheral rate.

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D