20 Centavos 1978 (Pyramid of the Sun): Value & Prices

If you found a 1978 Mexican 20 centavos coin with a pyramid on it, here is the honest answer: in worn, circulated condition it is worth a few cents to maybe a quarter, not a fortune. These were struck by the tens of millions and circulated heavily. The value only climbs when you have one in uncirculated condition with full original luster.

This coin is not silver. It is cupronickel (a copper-nickel alloy), so it has no precious-metal melt value to fall back on. Anyone telling you an old 1978 Mexican coin is worth hundreds of dollars because it is "old" is repeating a myth. Age alone does not make a coin valuable. Rarity, demand, and grade do.

What this coin actually is

The 20 centavos of 1978 was minted at the Casa de Moneda de México (the Mexican Mint). The reverse shows the Pirámide del Sol, the Pyramid of the Sun at Teotihuacán, one of the most recognizable images on Mexican coinage from that era. The obverse carries the national coat of arms with the legend "Estados Unidos Mexicanos" (United Mexican States, the country's official name).

The specifications, which matter if you are checking whether yours is genuine:

Feature	Detail
Denomination	20 centavos
Year	1978
Metal	Cupronickel (copper-nickel)
Weight	3 grams
Diameter	20 mm
Edge	Plain (smooth)
Reverse design	Pyramid of the Sun, Teotihuacán
Mint	Casa de Moneda de México

The cupronickel version of this denomination was issued through much of the 1970s. The peso was losing purchasing power at the time, so low-value coins were made from cheaper alloys instead of silver. That is why a 1978 coin like this has no bullion floor.

Is it rare? What is it worth?

No, it is not rare. It circulated for years, so worn examples turn up constantly in old coin jars and inherited boxes. Realistic values:

• Circulated (worn): a few cents, roughly 0.10 to 0.50 USD to a collector who needs the date.
• Uncirculated (UNC) or Brilliant Uncirculated (BU): original mint luster, no handling wear, these are genuinely harder to find and command a real premium, often several dollars, occasionally more for a top-graded example.

The difference is condition. A coin that spent years in someone's pocket is worth cents. A coin that never circulated, with its original shine intact, is what collectors chase for a year-by-year 1970s set. This is a good entry-level coin for anyone building that kind of collection.

Coins with errors can be worth more

Genuine minting errors (off-center strikes, die rotation, double strikes, recognized varieties) can multiply the value if they are verifiable. Be careful, though: most "errors" people post online are post-mint damage, dents, scratches, and corrosion from circulation, not factory mistakes. If you think you have a real one, get a second opinion before you get excited.

How to check what yours is worth

1. Grade it honestly. Look for wear on the high points of the pyramid and the eagle. Full detail and shine means a higher grade and more money. Rubbed, dull, or scratched means a common coin.
2. Verify it is genuine. Weigh it on a jewelry scale (should be 3 grams) and measure the diameter with calipers (should be 20 mm). Counterfeits usually miss the weight or diameter, or show flat relief and off color.
3. Get a real appraisal. A verified coin shop from the Pesoteca directory will value it on the spot. For collector-to-collector deals, the Pesoteca buy-and-sell forum is safer than dumping it to the first Facebook offer.

Because this coin belongs to the family of 1970s Mexican coins with pre-Hispanic archaeological themes, collectors often want it as part of a set rather than as a single trophy piece. That set demand is what supports the price of nicer examples.

Have a 1978 20 centavos with unusual detail, or a full run of these you inherited? Post clear photos of the front, back, and edge in the Pesoteca forum and let the community tell you if you have a common coin or something worth setting aside.

Centavo coins form the base of the Mexican monetary system. Banxico has changed their diameters, materials and alloys several times over the past few decades to optimize minting costs. The 20 centavos Cupronickel piece struck in 1978 belongs to the Banxico Numismatic Collection catalog documented on its official site.

For Mexican collectors, centavo pieces have value when they capture a change of material, a die error or an atypically low mintage. Banxico has published annual mintages in CM10 since the year 2000. For earlier pieces the data may not be available. This entry follows the convention of the PSM System, one ID per distinct physical piece, not per shared design.