Don't see this legend error every day. (5/28 update!)

TwoKopeiki

Unlike reworked dies (over-dates, over-assayers) that were done as part of business as usual operations at the mint when changes occurred, actual mint errors are not as common and usually detected and corrected quickly. That's why there's only a single die with errors like the "1872" (instead of 1782), CARLUS (instead of CAROLUS), FERD IIV (instead of FERD VII). Die sinkers made mistakes and when they realized it before the die went into production, they would quickly fill the mistake with softer metal and punch the correct die element over it. I've documented a number of examples of the letter / number punches being used upside-down and a few legend corrections, such as the coin below.

This one is very drastic and obvious about what was done. The G in GRATIA was accidentally punched into the die twice and corrected.

May 28, 2025 Update

I know I said these types of errors are uncommon, but I was able to pick up another example of a legend error from the recent Aureo sale. This time the die sinker mistakenly picked up the F punch instead of P when spelling HISPAN and ended-up correcting the spelling afterwards. Another very clear under type and a new variety for the books.

Here's what the F letter in the assayer looks like for illustration.

WorldTypeSet

Very nice. Is something also going on with the A and T?

TwoKopeiki

@MyWorldCoinTypeSet said:
Very nice. Is something also going on with the A and T?

Good call-out! There's something at the base of the T, but not as obvious as the R/G

TwoKopeiki

Updated with a new discovery!

Bob13

Interesting!

JohnnyCache

I really like that new discovery. Nice find!
There's so much yet still left to discover.

coinkat

Congrats... well done

TwoKopeiki

Thanks everyone. I'm starting to feel like completing my collection of major and minor varieties for only one denomination and a small span of 49 years of Mexico City Mint's long history might require getting one of my kids into numismatics