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The last Ecuadorian coins that bore a mint mark indicating where they were produced were made in 1944 (Mexico). Ecuadorian coins since 1944 have continued being produced by foreign mints, although it now requires active research to find out the mints used after this time period. Little by little, through information from various mints, newspaper articles, books, etc., I hope to be able to piece together this puzzle. Below I will include a summary of my discoveries, as well as additional links to evidence.

Note: Clicking on a linked mint name such as Philadelphia will take you to their website; clicking on a bibliographical reference such as 4 will take you to information on that reference.
Coins with mintmarks
The Ecuadorian coins with mintmarks pose no special problem for attributing the mint. A quick reference to the abbreviations used and summary of the coins minted is below. (Sources for this quick reference are  Seppa & Anderson8, KM9, Altz & Barton10 and my personal collection.) 
 
MINTMARK
MINT
COINS ON WHICH APPEARS
BIRMINGHAM HEATON BIRMINGHAM (ENGLAND) 10 SUC. 1899, 1900
25 SUC. 1928
D DENVER (USA) 5 CENT. 1944
20 CENT. 1944
D.T. SANTIAGO CHILE SANTIAGO (CHILE) 1 DEC. 1889
2 DEC. 1889, 1891
1 SUC. 1888, 1889
H HEATON BIRMINGHAM (ENGLAND) 1/2 CENT. 1890, 1909
1 CENT. 1890, 1909
2 CENT. 1909
5 CENT. 1909, 1924
10 CENT. 1924
H.  BIRMm HEATON BIRMINGHAM (ENGLAND) 1/2 DEC. 1915
1 DEC. 1915
HEATON HEATON BIRMINGHAM (ENGLAND) 1 CENT. 1872
2 CENT. 1872
HEATON BIRMINGHAM HEATON BIRMINGHAM (ENGLAND) 1/2 CENT. 1884, 1886
1 CENT. 1884, 1886
1/2 SUC. 1884
1/2 DEC. 1884, 1886
1 DEC. 1884, 1889, 1890
2 DEC. 1884, 1889, 1890
1 SUC. 1884, 1888, 1889, 1890, 1892, 1895
HF LELOCLE (SWISS) 5 CENT. 1937
10 CENT. 1937
20 CENT. 1937
1 SUC. 1937
LIMA LIMA (PERU) 1/2 DEC. 1893, 1894, 1897, 1899, 1902, 1905, 1912
1 DEC. 1892, 1893, 1894, 1899, 1900, 1902, 1905, 1912
2 DEC. 1889, 1891, 1892, 1893, 1894, 1895, 1896, 1912, 1914, 1915
1 SUC. 1890, 1891, 1892, 1895, 1896, 1897
Mo. MÉXICO MEXICO 2 SUC. 1944
5 SUC. 1943, 1944
PHILA. PHILADELPHIA (USA) 1 DEC. 1916
PHILA·U·S·A PHILADELPHIA (USA) 50 CENT. 1928, 1930
1 SUC. 1928, 1930, 1934
2 SUC. 1928, 1930
PHILADELPHIA PHILADELPHIA (USA) 2 DEC.  1914, 1916
Coins without mintmarks, pre-dollarization
1 Centavo
Date Mint Mintage Composition Weight Diameter
1928 Philadelphia8,10 2,016,0008,9,10 Bronze9,10
95% copper, 5% tin & zinc8		 3.5 g.8 20.5 mm.8

2 1/2 Centavos

Date Mint Mintage Composition Weight Diameter
1917 Philadelphia8,10 1,600,0008,9,10 75% Copper, 25% Nickel8,9,10 2.5 g8 19 mm.8
1928 Philadelphia8,10 4,000,0008,9,10 Copper-Nickel10
Nickel8,9		 2.5 g8 18.5 mm.8

5 Centavos

Date Mint Mintage Composition Weight Diameter
1917 Philadelphia8,10 1,200,0008,9,10 75% Copper, 25% Nickel8,9,10 3 g8 21 mm.8
1918 Philadelphia8,10 7,980,008,9,10 75% Copper, 25% Nickel8,9,10 3 g8 21 mm.8
1919 Providence8,10 12,000,008,9,10 75% Copper, 25% Nickel8,9,10 3 g8 20 mm.8
1928 Philadelphia8,10 16,000,0008,9,10 Copper-Nickel10
Nickel8,9		 3 g8 19.5 mm.8
1942 Philadelphia8,10 2,000,0008,9,10 80% Copper, 20% Zinc8
Brass9,10		 2 g8 17 mm.8
1946 Philadelphia8,10 40,000,0008,9,10 75% Copper, 25% Nickel8,9,10 2 g8 17 mm.8

10 Centavos

Date Mint Mintage Composition Weight Diameter
1918 Philadelphia8,10 1,000,0008,9,10 75% Copper, 25% Nicke8,9,10 5 g8 22 mm.8
1919 Providence8,10 2,000,0008,9,10 75% Copper, 25% Nickel8,9,10 5 g8 22 mm.8
1928 Philadelphia8,10 5,000,00010
16,000,0008,9		 Copper-nickel10
Nickel8,9		 4 g8 21.5 mm.8
1942 Philadelphia8,10 5,000,0008,9,10 80% Copper, 20% Zinc8
Brass9,10		 3 g8 19 mm.8
1946 Philadelphia8,10 40,000,0008,9,10 75% Copper, 25% Nickel8,9,10 3 g8 19 mm.8
1964 Altona8 20,000,0008,9 Nickel clad steel8,9 3 g8 19 mm.8
1968 Altona8 15,000,0008,9 Nickel clad steel8,9 3 g8 19 mm.8
1972 Altona8 20,000,0008,9 Nickel clad steel8,9 3 g8 19 mm.8

20 Centavos

Date Mint Mintage Composition Weight Diameter
1942 Philadelphia8,10 5,000,0008,9,10 80% Copper, 20% Zinc8
Brass9,10		 4 g8 21 mm.8
1946 Philadelphia8,10 30,000,0008,9,10 75% Copper, 25% Nickel8,9,10 4 g8 21 mm.8
1959 Altona8 14,400,0008,9 Nickel clad steel8,9 3.6 g8 21 mm.8
1962 Altona8 14,400,0008,9 Nickel clad steel8,9 3.6 g8 21 mm.8
1966 Altona8 24,000,0008,9 Nickel clad steel8,9 3.6 g8 21 mm.8
1969 Altona8 24,000,0008,9 Nickel clad steel8,9 3.6 g8 21 mm.8
1971 Altona8 12,000,0008,9 Nickel clad steel8,9 3.6 g8 21 mm.8
1972 Altona8 48,432,0008,9 Nickel clad steel8,9 3.6 g8 21 mm.8

50 Centavos

Date Mint Mintage Composition Weight Diameter
1963 Altona8 20,000,0008,9 Nickel clad steel8,9 5 g8 23 mm.8
1971* Altona8 5,000,0008,9 Nickel clad steel8,9 5 g8 23 mm.8
1988 Royal Canadian Mint1 100,0009
Unavailable1		 Nickel clad steel1 2.95 g1 18 mm.1

*Seppa lists a 1972 coin with a mintage of 5,000,000 but this is not listed in Krause and is not represented in my collection; apparently he meant 1971

  1 Sucre

Date Mint Mintage Composition Weight Diameter
1946 Philadelphia8,10 18,000,0008,9,10 Nickel8,9,10 7 g8 26 mm.8
1959 London8 8,400,0008,9 75% Copper, 25% Nickel8,9 7 g8 26 mm.8
1964 Altona8 20,000,0008,9 Nickel clad steel8,9 7 g8 26 mm.8
1970 Altona8 24,000,0008,9 Nickel clad steel8,9 7 g8 26 mm.8
1971 Altona8 8,092,0008,9 Nickel clad steel8,9 7 g8 26 mm.8
1986 Royal Canadian Mint1 Unavailable1 Nickel clad steel1 Unavailable1 26 mm.1
1988 Royal Canadian Mint1
British Royal Mint7		 Unavailable1 Nickel clad steel1 3.05 g1 20 mm.1

5 Sucres

Date Mint Mintage Composition Weight Diameter
1988 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 5.25 g1 22 mm.1

10 Sucres

Date Mint Mintage Composition Weight Diameter
1988 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 6.25 g1 24 mm.1
1991 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 6.25 g1 24 mm.1

20 Sucres

Date Mint Mintage Composition Weight Diameter
1988 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 8.25 g1 26 mm.1
1991 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 8.25 g1 26 mm.1

50 Sucres

Date Mint Mintage Composition Weight Diameter
1988 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 8.55 g1 28 mm.1
1991 Royal Canadian Mint1 Unavailable1 Nickel Clad Steel1 8.55 g1 28 mm.1

100 Sucres

Date Mint Mintage Composition Weight Diameter
1997 Deutsche Nickel A.G.2 ? ? 7.2 g. 4 19.5 mm.3,4

500 Sucres

Date Mint Mintage Composition Weight Diameter
1997 Casa de la Moneda Chilena2 ? ? 5.7 g.4 21.5 mm.3,4

1000 Sucres

Date Mint Mintage Composition Weight Diameter
1997 Casa de la Moneda Chilena2 ? ? 3.6 g.4 23.5 mm.3,4
 
Coins without mintmarks, post-dollarization

monedas-circulacíon
 
1 Centavo
Date Mint Mintage Composition Weight Diameter
2000 Royal Canadian Mint5,11 ? 70% copper, 30% zinc.6 ? 19.05 mm.6

5 Centavos

Date Mint Mintage Composition Weight Diameter
2000 Casa de la Moneda de México5,11 ? Nickel Clad Steel.6 ? 21.21 mm.6

10 Centavos

Date Mint Mintage Composition Weight Diameter
2000 Casa de la Moneda de México5,11 ? Nickel Clad Steel.6 ? 17.91 mm.6

25 Centavos

Date Mint Mintage Composition Weight Diameter
2000 Casa de la Moneda de México5,11 ? Nickel Clad Steel.6 ? 24.26 mm.6

50 Centavos

Date Mint Mintage Composition Weight Diameter
2000 Casa de la Moneda de México5,11 ? Nickel Clad Steel.6 ? 30.61 mm.6
References
1: Foreign coins Struck by the Royal Canadian Mint. Website by Patrick Glassford.
Click here to go to the original site, or here to view a local copy of the Ecuador page.

2: "Se emitirán monedas de 6 y 10 mil sucres." Newspaper El Universo, 12/nov/1997, Primera Sección, p. 3 

3: "Circularán 100 millones de monedas de 100, 500 y 1000." Newspaper El Universo, 14/nov/1997, Primera Sección, p. 2

4: "El Banco Central del Ecuador... Nuevas monedas de 100, 500 y 1.000 sucres, características:" Informe al público, Banco Central del Ecuador, 1997. 

5: "Desde agosto llegan las nuevas monedas." Newspaper El Universo, 13/jun/2000, Primera Sección, p. 1.

6: "Diseños definitivos de las monedas." Newspaper El Universo, 6/jun/2000, Primera Sección, p. 3.

7: "Autorizan fabricar nuevos ayoras." Newspaper El Mercurio, 26/may/1987, p. 1A 
 
 

Autorizan fabricar nuevos ayoras
Quito--El contralor General del Estado, doctor Marcelo Merlo Jaramillo, emitió informe favorable para la suscripción del contrato entre el Banco Central del Ecuador y la Royal Mint de Inglaterra para la acuñación y provisión de monedas deun sucre, por un valor de 1.841.000 dólares.

El presente contrato puede celebrarse sin licitación ni concurso de ofertas, por así permitirlo el Decreto Supremo No. 798-A, de 29 de setiembre de 1976, habiéndose expedido por parte de la Junta Monetaria las normas y procedimientos a cumplirse en el proceso de contratación, conforme lo dispone el Art. 139, letra b). de la ley de Régimen Monetario.

8: The Coins of Ecuador: Las Monedas de la Patria. By Dale Seppa & Michael Anderson. 1973. Second Edition.

9: Standard Catalog of World Coins. By Chester L. Krause and Clifford Mishler.

10. Foreign Coins Struck at United States Mints. By Charles G. Altz & K.H. Barton. 1964. Whitman Publishing Company.

11:  "México acuñará monedas fraccionarias de dólar para Ecuador". Reuters news article in Yahoo News, Tuesday, June 13, 2000, 1:24 AM. Click here to view a local copy of this article on my website. 
See also the following pages for related listings:

View/report errors in standard catalogs or other reference works
View/confirm reported but unconfirmed varieties or issues
View/report newly discovered varieties or new issues
Help estimate Ecuadorian rare coin populations: report your rare or unique coins
Announcing two new varieties of the 1833 1 Real!
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