I bought this 6502 microprocessor from eBay and the date code says "1927"- shouldn't that imply that this MPU was back in the 19th week of 1927? Did I just get a bootleg/ knock-off 6502?

Any information given to me will be thanked and appreciated in advance!

Maybe this thread would be useful:

viewtopic.php?f=4&t=6027&start=15

What does the underside of your chip look like?

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"The key is not to let the hardware sense any fear." - Radical Brad

My best guess would be that its fake / reproduction, and whoever did it didn't know that MOS used an unusual WWYY format instead of the more normal YYWW: under YYWW it would be 27th week of 2019, which would make sense for a reproduction (or they just stuck some numbers on and hoped no-one would notice).

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Want to design a PCB for your project? I strongly recommend KiCad. Its free, its multiplatform, and its easy to learn!
Also, I maintain KiCad libraries of Retro Computing and Arduino components you might find useful.

Here's 2 pics of the underside. There is some text, but it's really faded. The only word I could make out is "R6502 F2" and "KOREA"

There is also some stains and scratches on the bottom.

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

I have emotional Damage.

I believe Jameco is a good source for actual vintage components. Unless anyone has experience otherwise.

eBay and Ali-Express are such gambles. What I usually try doing with eBay is sticking to US sellers only (if I can).

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Cat; the other white meat.

I think the part should work. No doubt it has been “pretty up” to improve its appearance (much like kids sandpapering old coins to make it shiny and destroying its numismatic value along the way), but underneath the new blacktop appears to be a 6502 so I’d say your chance of a working 6502 is quite good.
Bill

Thank you very much for this info! Now I a little less saddened by getting this chip!

I'll use Jameco next time I buy a 6502, thx for the info!

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

it put it simply, I want both an old 6502 and a new 6502. so my collection can be complete, though I also want a 6502 from Rockwell and the R65c02 from them as well, alongside with the other variants they've made.