Dramatic Errors of the Spanish Colonial 8 Reales Series
Boosibri
Posts: 12,638 ✭✭✭✭✭
The Spanish Colonial 8 Reales series is ripe for interesting errors, especially taking the form of misspellings in the legends. While over dates and over-assayers are frequently found with careful study (and we have our resident expert @TwoKopeiki), these dramatic legend errors are bold and self-evident. Most are incredibly rare, emanating from a single die pairing before th error was caught or the die was decommissioned.
Here are the top errors which I have noted:
1768-PTS "VRTA" - 4 coins observed
1813-PTS Ferdinand "IIV" - 5 coins observed
1796-So "C/RAROLUS" -3 coins observed
1800-So "CROLUS" - 3 coins observed and one rumor to be overstruck with a Brazilian countermark
1746-Mo "VRTUQUE" - 3 coins observed
1771-LM "HIAPSN" - 3 coins observed

1796-LM "R8" - 3 coins observed
1798-LM "R8" - 1 coin observed

Comments
"1872" Mo FF 8 Reales.


My photos, but not my coin:
Nice list! Maybe the 1804 "CARLUS" should also be included?
The War of Independence issues have some nice errors, the 1812 Durango "R8", Zacatecas "IERDIN", "FERDID", and 1821 8 s R, but I think the ones on your list are much better known.
A number of minors... GRTIA, GARTIA...
1797 Santiago 1/2... the CARLUS version seems at least as common as the normal one!
1804 CARLUS and the 1872 (1782) that @Plus00Vltra linked above from the 8R portraits from Mexico.
I look forward to more input, so I will prime the pump by posting another in the spirit of the thing, albeit an 8 Escudos:

1751 So J 8E with dramatic "FERDINANUS" error.
Likely from the 1752 wreck of the Nuestra Señora de la Luz, but I could not find mention of it nor photograph in the 1993 Sotheby's auction catalog, despite a careful study of dies and die marriages by the cataloger.
Not my coin, unfortunately. It sold at AUREO & CALICÓ in 2015.
Big die crack
chopmarkedtradedollars.com
Very cool!
There is a laundry list here just from Zacatecas:
https://mexicannumismatics.com/history/war-independence/zacatecas-mint-reales
Yeah, I took a look through again to refresh myself, there really are an absurd number of varieties/errors for Zacatecas 1813 - 1822 coinage. I have picked a few of them over my time collecting but I do not have the @TwoKopeiki levels of patience necessary to take on the task of collecting those by variety.
I'd love to have the 1768 Potosi 8R, but not because it's an error. I like the color. I only recall two high quality (AU) sold of this date since I've been collecting pillars (back to 2002), and both were untoned.
MEXICO. 1/2 Real, 1773-Mo FM. Mexico City Mint. Charles III. NGC MS-63.
KM-69.2; Yonaka-M05-73b. Variety with "CAROLS" spelling.