$56.30 / troy oz
Spot as of Oct 22, 2026 12:15 AM · $1 move in silver changes this coin by $0.3857
What this coin is
The reduced UN PESO of 1920–1945 is 16.66 g, .720 fine, about 0.3856 oz ASW. Still reads UN PESO. Not the Caballito and not the Morelos .500 peso.
What is written on the coin
UN PESO, cap and rays or related liberty types, .720 era. Search un peso.
Metal content (the melt spec)
Mint specification: 16.6600 grams at 72% fine, which is 0.38565 troy oz of pure silver (ASW). Formula: grams × fineness ÷ 31.1034768. Date and mintmark do not change that number. Melt today is $21.71 per coin at $56.30 silver.
Mintage
High mintage across many dates. Usually near melt unless uncirculated.
A little history
Silver per peso was cut after World War I. This is the common “un peso” in junk silver lots.
How to tell you have this type
Smaller and lighter than Caballito / 8 reales. Date 1920–1945.
Date and mintmark do not change the metal on this page. Collector value is a different market — a shop looks at date, mint, and condition. Melt is the floor.
Melt / coin$21.71
Silver spot$56.30
ASW0.38565 oz
Gross weight16.660 g
Fineness72%
Gross troy oz0.5356
Coins / oz2.59
If you want to sell Find a shop near you
A local coin shop can make an offer. Melt is the metal floor, not a quote. Many shops buy generic gold and silver as a percent of that number.
Before you sell
Usually near melt
If the coin is damaged or heavily worn, melt is a fair starting number. If it looks special, check collector solds before you sell.
Melt is the metal floor. A shop looks at date, mint, and condition. We list 437 types and ~11,000 melt values.
Quick amounts
Using $56.30 silver.
| You have | Pure oz | Melt |
|---|---|---|
| 1 coin | 0.3857 | $21.71 |
| 10 coins | 3.8565 | $217.12 |
| 20 coins | 7.7130 | $434.24 |
Silver chart
Where silver has been.
Melt alert
Email me if this coin’s melt crosses a number I set.
Related types
Same metal, nearby coins.
Mexico 5 pesos Hidalgo 0.720 (CINCO PESOS)
1951–1954 · 0.64310 ASW
$36.21
Mexico Caballito peso (UN PESO)
1910–1914 · 0.78590 ASW
$44.25
Mexico peso Morelos 0.500 (UN PESO)
1947–1949 · 0.22506 ASW
$12.67
Mexico 2 pesos 1921 (DOS PESOS)
1921 · 0.77170 ASW
$43.45
Mexico 5 pesos Cuauhtémoc (CINCO PESOS)
1947–1948 · 0.86810 ASW
$48.87
Mexico 10 pesos Hidalgo silver (DIEZ PESOS)
1955–1960 · 0.83570 ASW
$47.05
Mexico 25 pesos 1968 Olympics (VEINTICINCO PESOS)
1968 · 0.52080 ASW
$29.32
Mexico 100 pesos Morelos (CIEN PESOS)
1977–1979 · 0.64280 ASW
$36.19
Questions people ask
How much pure silver is in a Mexico peso 0.720 (UN PESO)?
Mint spec is 16.660 grams at 72% fine, which is 0.38565 troy oz of pure silver (ASW). Date and mintmark do not change that.
What is a Mexico peso 0.720 (UN PESO) worth in melt today?
At silver spot of $56.30 per troy oz, one coin’s melt is $21.71. Multiply by how many you have. A rare date or a nice grade can sell for more than melt.
How many Mexico peso 0.720 (UN PESO)s equal one ounce of silver?
About 2.59 coins equal 1.00 troy oz of pure silver at mint weight.
Does mintmark change the melt value?
No. Mintmark and date do not change the metal for this composition. A Mexico City (Mo) piece and another mint of the same spec have the same melt. Collector premiums still follow date, mint, and grade.
Is melt what I should sell this Mexico peso 0.720 (UN PESO) for?
Most common circulated examples trade close to the metal. Better grade, proofs, and scarce dates are the exceptions. If the coin is damaged or heavily worn, melt is a fair starting number. If it looks special, check collector solds before you sell.
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