Decimal issues of the Alamos mint

Copper

One centavo 

Diameter 25 mm. 

Date	Recorded Mintage	Comment
1875
1876
1880
1881

 

Silver

Five centavos

Diameter 15 mm. 1.353 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1874	DL
1875	DL
1876	L
1878	L		mule, gold peso obverse
1879	L		mule, gold peso obverse
1880	L		mule, gold peso obverse
1886	L
1887	L
1888	L
1889	L
1890	L
1891	L
1892	L
1893	L
1895	L

 

Ten centavos 

Diameter 17 mm. 2.707 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1874	DL
1875	L
1876	L
1878/5	L
1878	L
1879	L
1880	L
1882	L
1883	L
1884	L
1885	L
1886	L
1887	L
1888	L
1889	L
1890	L
1891	L
1891	L		Struck over 1889 H, G
1892	L
1893	L

 

Twenty-five centavos

Diameter 25 mm. 6.768 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1874	L
1875	L
1876	L
1877	L
1878	L
1879	L
1880	L
1881	L
1882	L
1883	L
1884	L
1885	L
1886	L
1887	L
1888	L
1889	L
1890	L

 

Fifty centavos

Diameter 30 mm.13.536 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1875	L
1876/5	L
1876	L
1877	L
1878	L
1879	L
1880	L
1881	L
1884	L
1885	L

 

Gold

One peso

Diameter 15 mm.1.692 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1888	L		Struck over M, M
1888	L

 

KM-410 $1 1888 AsL/M (Stack’s-Bowers NYINC auction, 12 January 2019, lot 41221)

The only gold Peso issue from the Alamos mint. It is evident that the entire engraving was re-engraved on a Mexico City peso die. Close inspection reveals remnants of an M beneath the L assayer letter as well as the faint shadow of a bar below the s in the As mintmark where an Mo mintmark once existed. 

2½ pesos 

Diameter 18 mm. 4.230 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1888	L		Struck over M, M

 

KM-411 $2½ 1888 As/MoL (Briggs & Bustos auction VIII, April 2024, lot 381)

In the description Briggs & Bustos state: "One of the many rarities for this year, this unusual and rare denomination by itself was struck only in 1888 at the Alamos mint, with a mintage that remains unknown. As is the case with some other mints, it is interesting that all of these specimens were struck with a reverse engraved in the As/Mo mintmark, with no trace of an assayer over-assayer. Although there is no documentation, one theory is that they may have been prepared as part of a "presentation" cone ordered by the Mexican mint, for which dies were sent from the capital to various mints in order to complete the cone for this date. The truth is that this piece is much rarer than the 1 peso gold coins of the same date and mint that also present the As/Mo re-engraving in mint, we did not locate public records at auction for this type in the last three decades."

 Five pesos 

Diameter 22 mm. 8.460 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1878	L

 

Ten pesos 

Diameter 27 mm. 16.920 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1874	DL
1875	DL
1875	L
1878	L
1879	L
1880	L
1881	L
1882	L
1883	L
1884	L
1885	L
1886	L
1887	L
1888	L
1889	L
1890	L
1891	L
1893	L
1894/3	L
1894	L
1895	L

 

Twenty pesos

Diameter 34 mm. 33.840 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1876	L
1877	L
1888	L

 

 

 

Decimal issues of the Alamos mint

Silver

Five centavos

Diameter 15 mm. 1.353 g. 0.9027 silver 

Date	Recorded Mintage	Comment
1868
1869
1870/69
1870

  

Date	Asssayer	Recorded Mintage	Comment

 

Ten centavos 

Diameter 18 mm. 2.707 g. 0.9027 silver 

Date	Recorded Mintage	Comment
1868/7
1868
1869
1870

 

Diameter 17 mm. 2.707 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Twenty-five centavos

Diameter 25 mm. 6.768 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Fifty centavos

Diameter 30 mm.13.536 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

One peso

Diameter 37 mm.27.073 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1872	P/M
1872	P
1872/1	M
1872	M
1873	M
1873	M/P
1873	P

 

Gold

One peso

Diameter 15 mm.1.692 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1888	M		CA/Mo

 

Five pesos 

Diameter 22 mm. 8.460 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1888	M

 

Ten pesos 

Diameter 27 mm. 16.920 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1888	M

 

Twenty pesos

Diameter 34 mm. 33.840 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment

 

 

 

 

Decimal issues of the Durango mint

Copper

One centavo 

Diameter 25 mm. 

Date	Recorded Mintage	Comment

 

Silver

Five centavos

Diameter 15 mm. 1.353 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Ten centavos 

Diameter 17 mm. 2.707 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Twenty-five centavos

Diameter 25 mm. 6.768 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Fifty centavos

Diameter 30 mm.13.536 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

One peso

Diameter 30 mm.27.073 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1870	P
1871	P
1872	P
1872	PT
1873	P

 

Gold

2½ pesos 

Diameter 18 mm. 4.230 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1888	C

 

Five pesos 

Diameter 22 mm. 8.460 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1873/2	P
1877	P
1878	P
1878/7	P
1879	P
1879/7

 

Ten pesos 

Diameter 27 mm. 16.920 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment

 

Twenty pesos

Diameter 34 mm. 33.840 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1870	P
1871/0	P
1871	P
1872	PT
1876	M
1877	P
1878	E

 

 

 

 

Decimal issues of the Guanajuato mint

Copper

One centavo 

Diameter 25 mm. 

Date	Recorded Mintage	Comment

 

Silver

Five centavos

Diameter 15 mm. 1.353 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Ten centavos 

Diameter 17 mm. 2.707 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Twenty-five centavos

Diameter 25 mm. 6.768 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

Fifty centavos

Diameter 30 mm.13.536 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment

 

One peso

Diameter 37 mm. 27.073 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1871/0	S
1871/3	S
1871	S
1872	S
1873/2	S
1873	S
1873	S/M		GO/MO

 

Diameter 39 mm. 27.073 g. 0.9027 silver 

Date	Asssayer	Recorded Mintage	Comment
1898	RS
1898	RS		GO/MO
1899	RS
1900	RS

 

Gold

One peso

Diameter 15 mm.1.692 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment

 

2½ pesos 

Diameter 18 mm. 4.230 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment

 

KM-411.3 $2½ 1888 Go over Mo (Briggs & Bustos auction VIII, April 2024, lot 382)

Last date struck at the Guanajuato mint in this rare denomination, the key piece with a mintage of only 110 pieces reported. Elusive as are all the 1888 issues, a very interesting fact is that all of these were struck with a reverse with a re-engraved Go/Mo mint mark, none of them show any trace of an over-assayer. 

Five pesos 

Diameter 22 mm. 8.460 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1871	S
1887	R
1888	R
1893	R

 

Ten pesos 

Diameter 27 mm. 16.920 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment
1872	S
1887	R
1888	R

 

Twenty pesos

Diameter 34 mm. 33.840 g. 0.8750 gold 

Date	Asssayer	Recorded Mintage	Comment