Possible error on Missouri quarter

I got a Missouri quarter in change yesterday. Not familiar with the design, I put it on my scanner to examine it more closely, then looked up an image of what it is supposed to look like. Supposed to say "CORPS OF DISCOVERY"; this quarter reads "COPPS OF DISCOVERY". Has anyone seen this error before? j Sorry I am new at this, don't yet know how to attach an image.
Bob Anderson
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Possibly a filled die wherein a blob of grease blocked the leg of the R so that the coin metal could not flow into it. If so a cute error, but not worth much.
Sorta like that Seinfeld episode, "Who invaded Spain in the 8th century?"
Thanks, I have scanned the coin from several angles, and indeed the leg of the R is actually there, but not in high relief. Just an ordinary quarter.
The mint made an oops! I mean Moops. No, I mean COPPS.
"To Be Esteemed Be Useful" - 1792 Birch Cent --- "I personally think we developed language because of our deep need to complain." - Lily Tomlin
@bob_anderson...Welcome aboard.... Cheers, RickO