Reales issues of the San Luis Potosí mint (8 reales)
KM-377.12 8r 1857 MC (Briggs & Bustos)
Diameter 39 mm. 27.070 g, 0.90277 silver
| Date | Asssayer | Recorded Mintage |
Comment |
| 1827 | Sa | This die style continued through 1839 | |
| 1827 | JS | The Sa was changed to JS and moved to the right of the date, probably to conform with the law and the coins being issued by the other mints | |
| 1828/7 | JS | ||
| 1828 | JS | ||
| 1829 | JS | ||
| 1829 | JS | 9 over inverted 9 | |
| 1830 | JS | ||
| 1830 | JS | mintmark i over P | |
| 1831/0 | JS | ||
| 1831 3/2 | JS | ||
| 1831 | JS | ||
| 1831 | JS | no superscript s in 10D 20G | |
| 1832 3/2 | JS | ||
| 1832 8/0 | JS | illustrated below | |
| 1832 | JS | ||
| 1833/2 | JS | ||
| 1833 | JS | narrow date, planchet 37.5 mm | |
| 1833 | JS | wide date, planchet 38.5 mm | |
| 1834/3 | JS | ||
| 1834 | JS | ||
| 1835 | JS | 8 R denomination (illustrated below) | |
| 1835/4 | JS | 8 Rs denomination | |
| 1835 | JS | 8 Rs denomination (illustrated below). This denomiation continued on all issues of the San Luis Potosí mint through 1839 | |
| 1836 | JS | ||
| 1837 | JS | ||
| 1838/7 | JS | ||
| 1838 | JS | ||
| 1838 | JS | no superscript s after 8 R, or 10D, and no letter i after P in the mintmark | |
| 1839 | JS | ||
| 1840 | JS | a die style change that continued through 1842. The new cap is higher relief with greater detail. The new eagle is similar, but the wing tips are less pointed and the tail is blunt. | |
| 1841 | JS | ||
| 1841 | JS | iP mintmark error | |
| 1842/1 | JS | ||
| 1842 | JS | This date concludes the die style of 1840-1842 | |
| 1842/1 | PS/JS | new die style that continues through 1856. The eagle has a longer, thinner neck and an elongated and thinner left wing | |
| 1842 | PS/JS | ||
| 1842 | PS | ||
| 1843/2 | PS | round top 3 | |
| 1843 | PS | round top 3 | |
| 1843 | PS | flat top 3 | |
| 1843 | AM | flat top 3 | |
| 1844 | AM | ||
| 1845/4 | AM | ||
| 1845 | AM | ||
| 1845 | AM | no superscript s in 10D 20G | |
| 1846/5 | AM | ||
| 1846 | AM | ||
| 1846 | AM | 6 made from an inverted 9 punch | |
| 1847 | AM | ||
| 1848 | AM | ||
| 1849 | AM | medal axis | |
| 1849 | AM | coin axis. one die was misaligned 180 degrees. The official change in San Luis Potosí did not occur until 1854 | |
| 1849/8 | PS/AM | ||
| 1849 | PS/AM | ||
| 1849 | PS | ||
| 1849 | MC/PS | ||
| 1849 | MC | ||
| 1850 | MC | ||
| 1850 | MC | M over inverted M in assayer | |
| 1851 | MC | ||
| 1852 | MC | ||
| 1852 | MC | M over inverted M in assayer | |
| 1853 | MC | ||
| 1854 | MC | During this year San Luis Potosí changed from coin axis to medal axis. Coin axis | |
| 1854 | MC | medal axis | |
| 1855 | MC | ||
| 1856 | MC | ||
| 1857 | MC | a new die style begins and continues through 1863. The eaglr is now in lower relief and therefore more frequently well struck. It is also probable that the mint started using new or improved equipment at the beginning of this year as is evidenced by the improved quality of the coinage | |
| 1857 | PS/MC | ||
| 1857 | PS | a die style of 1857-1858 features a very distinctive eagle, which has a shorter fatter appearance and is almost a throwback to the die style of 1840-1842. | |
| 1858 | PS | die style of 1857-1858 | |
| 1858 | MC/PS | die style of 1857-1863 | |
| 1858 | MC | ||
| 1859/8 | MC/PS | the 9 is filled so this may be 1859/8 or a repunched 9 | |
| 1859 | MC | ||
| 1859 | PS/MC | ||
| 1860 | MC | ||
| 1860 | FC | ||
| 1860 | FE | ||
| 1860 | PS/FE | ||
| 1860 | PS | ||
| 1860 | PS | 6 over an inverted 6 in the date | |
| 1860 | RO | ||
| 1861 | PS | ||
| 1861 6/1 | RO | ||
| 1861 | RO | ||
| 1861 | RO | P mintmark (mo i) | |
| 1862/1 | RO | ||
| 1862/1 | RO | 6 is an inverted 9 | |
| 1862 | RO | ||
| 1862 | RO | 6 is an inverted 9 | |
| 1863/2 | RO | ||
| 1863 | RO | die style of 1857-1863 | |
| 1863 | RO | die style of 1863-1864, features a broader cap with a much larger opening across the entire cap base | |
| 1863 | FC | unique die style, with uniqur eagle. Also, all lettering is neat and well punched ffrom undamaged punches, 0 of 10Dz is repunched, small raised dot between the D of 10Ds and the period below the superscript s | |
| 1864 | RO | issued while Maximilian's forces controlled the mint (25 December 1863 - 25 December 1866) | |
| 1867 | LR | a new die style which continued through 1870 | |
| 1867 | CA | ||
| 1867 | PS/CA | ||
| 1867 | PS | ||
| 1868/7 | PS | ||
| 1868/P | PS | ||
| 1868 | PS | ||
| 1869/8 | PS | Dunigan and Parker report that all specimens they had examined have been 9's that were closed or joined due to die breaks or wear | |
| 1869 | PS | ||
| 1869 | PS | 6 over an inverted 6 | |
| 1870/69 | PS | ||
| 1870 | PS | probably 8 reales were coined for only a short time before giving way to the Balance Scale peso. | |
| 1873 | MH | coinage of the 8 reales resumed, probably in the latter half of the year. This die style continued through 1887 | |
| 1874/3 | MH | ||
| 1874 | MH | ||
| 1875 | MH | ||
| 1876/5 | MH | ||
| 1876 | MH | ||
| 1877/6 | MH | 1,018,000 | |
| 1877 | MH | ||
| 1878 | MH | 1,046,000 | |
| 1878 | MH | P mintmark, no superscript i | |
| 1879/8 | MH | ||
| 1879 | MH | ||
| 1879 | BE | ||
| 1879 | MR | ||
| 1880 | MR | ||
| 1880 second 8 over 7 |
MH/R | ||
| 1880 | MH/R | ||
| 1800 | MH | ||
| 1881 | MH | 2,100,000 | 8/1 in 8 R |
| 1881 | MH | ||
| 1882 | MH | 1,602,000 | |
| 1882/1 | MH | ||
| 1883 | MH | 1,545,000 | |
| 1884/3 | MH | ||
| 1884 | MH/MM | ||
| 1884 | MH | ||
| 1884 | MH | no superscript s in 10D 20G | |
| 1885/4 | MH | 1,736,000 | |
| 1885/8 | MH | ||
| 1885 | MH | ||
| 1885 | LC | ||
| 1886 | LC | 3,347,000 | |
| 1886 | MR | ||
| 1887 | MR | 2,922,000 | die style of 1873-1887 |
| 1887 | MR | die style of 1887-1893 | |
| 1888/7 | MR | ||
| 1888 | MR | ||
| 1889 | MR | 2,438,000 | |
| 1890 | MR | 1,562,000 | |
| 1891 | MR | 1,184,000 | |
| 1892 | MR | 1,336,000 | |
| 1893 | MR | 530,000 |
KM-377.12 8r 1832/032 Pi JS (Stack’s Bowers auction, 28 February 2024, lot 73282)
KM-377.12 8r 1835 Pi JS (Stack’s Bowers auction, 23 February 2022, lot 74695)
Denomination engraved as "8 R".
KM-377.12 8r 1835 Pi JS (Stack’s Bowers auction, October 2021, lot 71500)
Denomination engraved as "8 Rs".
KM-377.12 8r 1859 Pi PS/MC (Stack’s Bowers auction, 28 February 2024, lot 73313)
KM-377.12 8r 1868/P Pi PS (Stack’s Bowers auction, 31 October 2023, lot 70822)
The overdate displays the extremely unusual numeric (8) over alpha (P) arrangement.
KM-377.12 8r 1870/69 Pi Ps (Stack’s Bowers Philadelphia ANA auction, 7 August 2012, lot 40691)
Counterfeits
counterfeit KM-377.12 8r 1836 Pi JS (Briggs & Bustos Counterfeit issues II, 10 August 2025, lot 77)
Struck on a planchet of mixed composition. 22.76 grams, 38 millimeters in diameter, coin alignment. The engraving is notably similar to that of the official issues from the San Luis Potosí mint, though the overall design is slightly cruder, and the edge cord appears thicker than usual. Metal composition: 46.31% copper, 27.16% silver, 13.57% zinc, 11.62% nickel, 0.6092% lead, 0.40% iridium, 0.2784% cobalt, and 0.0541% iron.