My thoughts also Marv. Nice to know I have an evil twin. ;-)

Yeah, slab that sucker, I bet it goes up $10 in value. Then lets have a party and bust it out!

I hope this isn't offensive, but chip errors, don't come close to mint errors. They have inspection, but with a plastic (clay/whatever) compound chip, without strict quality control, errors don't surprise me. What does surprise me is the sharp eyes out there that spot these. People don't generally look at chips too close. Yes WE do, but I mean in general. This one could have been in play until it wore out. Nice find.

Speculation. Since these inlays are printed on sheets, someone probably dropped in a $5 sheet, by accident. So there are probably 50 or more error chips like this one, out there in circulation. (still a very limited supply)