Simple steps to know what your 0.720 Mexican coin is worth—without stress.

Got a shiny old Mexican coin that says “0.720”? Nice find! You want to know, “What’s it worth right now?” Let’s make it super easy. We’ll use a tiny bit of math and a few quick checks so you don’t leave money on the table.

The quick answer

A 0.720 Mexican coin is worth two things added together: (1) its silver value and (2) any extra collector value. The silver value is 72% of the coin’s weight times the silver price. Collector value depends on date, condition, and how rare it is.

What “0.720” really means

“0.720” means the coin is 72% silver. The rest is other metals to make it strong. Think of a chocolate bar that is 72% cocoa—same idea. More silver = more melt value.

How to find the silver value (easy math)

• Step 1: Weigh the coin in grams (use a small scale).
• Step 2: Multiply the weight by 0.72 to get grams of pure silver.
• Step 3: Convert to troy ounces by dividing by 31.1035.
• Step 4: Multiply by the current silver price per troy ounce.

Formula (one line): Value = (Coin grams × 0.72 ÷ 31.1035) × Silver price per troy ounce.

Fast example (just to see it)

Say your coin weighs 14 g and silver is $30/oz (example numbers):

• Pure silver grams = 14 × 0.72 = 10.08 g
• Troy ounces = 10.08 ÷ 31.1035 ≈ 0.324 oz
• Melt value ≈ 0.324 × $30 ≈ $9.72

Your coin could sell for around the melt value—or more—if collectors want it.

When the value goes higher than melt

• Date & mint: Some years are harder to find.
• Condition: Shiny, sharp details = more value.
• Design & type: Special designs or short runs can add value.
• Errors & varieties: Odd letters or double strikes can be worth extra.
• Original look: Never clean the coin. Cleaning can lower value.

How to check your coin like a pro (at home)

• Weigh it: Use a kitchen or pocket scale (grams).
• Magnet test: Silver is not magnetic. If it sticks hard, be careful.
• Look at the edge and details: Read the date, and look for damage.
• Take clear photos: Front, back, and edge in good light.

Smart ways to sell (and what to ask)

• Local coin shop: Ask for the silver melt price and any collector premium.
• Online buyers/marketplaces: Compare offers. Watch fees and shipping.
• Auctions: Good for rare coins. Ask about seller fees first.

Common mistakes to avoid

• Cleaning the coin: Don’t do it. It can slash the value.
• Guessing the weight: Always measure.
• Forgetting fees: Selling costs can change your net.

Quick recap you can trust

Your 0.720 Mexican coin’s value = silver melt (72% of weight × silver price) + any extra collector value for date, rarity, and condition. Weigh it, do the simple math, and check if collectors want your exact coin. That’s it—you’ve got this!

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