These old copper coins were issued by the first Mexican Republic (REPUBLICA MEXICANA) between 1829 and 1837. Most all of them that you see are worn to a frazzle. If you can find one -- either the 1/8 or 1/4 real -- in well preserved condition, you have really found something! The 1/8 real (octavo) in our picture comes from Stack's Bowers and Ponterio where it sold for $300 US dollars in a 2011 auction.
Here are some typical catalog values for these coins:
1/8 REAL (or OCTAVO REAL)
worn: $1 US dollar approximate catalog value
average circulated: $25
well preserved: $200
octavo reals dated 1829 are more rare than other dates, double these values
1/4 REAL (or UN QUARTO or UNA QUARTILLA REAL)
worn: $2 US dollar approximate catalog value
average circulated: $10
well preserved: $20
un quarto reals dated 1829 are more rare, triple these values
un quarto reals dated 1832 and 1837 are more rare, double these values
As always on CoinQuest, these are catalog values that must be properly interpreted. Use our Important Terminology page for this purpose.
CoinQuest thanks Stack's Bowers Ponterio for use of their image.
Note to Francisco: If your coin actually says ESTADOS UNIDOS MEXICANOS (United States of Mexico), we would like to see a picture of it. The US of M did not mint coins until the early 1900s.