1978 Mexico 100 Pesos Morelos Silver Coin: Value & Worth

If you inherited or found a 1978 Mexico 100 Pesos featuring Morelos, here is the short answer: it is a real silver coin, so it has a floor value set by its metal content. It is not a rare six-figure rarity, but it is worth well more than face value. Circulated examples typically trade near their silver melt value, while certified high-grade pieces bring a premium.

What this coin actually is

This is a large silver commemorative struck in 1978 honoring José María Morelos, a leader of Mexico's War of Independence. It belongs to Mexico's modern pre-1992 era. The specific variety is the "dato en línea abajo del hombro" (design detail placed in a line below the shoulder), one of the die variations collectors track for this type.

Key specifications, exactly as issued:

• Weight: 27.79 grams
• Diameter: 39 mm
• Composition: .999 fine silver (99.9% pure)
• Edge: reeded
• Year: 1978 (single year of issue)

At .999 fineness and 27.79 grams, the coin contains roughly 0.777 troy ounces of pure silver. That silver content is the reason this coin can never be worth only face value. Whatever the current silver spot price, that is your baseline.

What it is worth in 2026

Value tracks three things: the silver spot price, the grade (how worn or pristine it is), and whether it is certified. Here is the realistic breakdown:

Condition	What it looks like	Typical value (USD)
Circulated	Visible wear, handled	Melt value (about 0.78 oz of silver)
Uncirculated (UNC)	No wear, original luster	Melt value plus a modest premium
Certified MS-65+	Graded and slabbed by NGC/PCGS	A meaningful premium over melt, into the low hundreds

Because silver moves daily, the smart way to price a circulated example is to check the current silver spot price and multiply by 0.777. That gives you the floor. Anything above that is the collector premium, which for this type is real but modest unless the coin is certified in top grades.

Do not expect thousands of dollars for an ordinary example. Sites promising huge sums for common Mexican silver are chasing clicks. The honest figure is: melt value for circulated pieces, a premium for genuine high grades.

How to tell if yours is genuine

Counterfeits of silver commemoratives exist, so verify before you buy or sell.

1. Weigh it. A genuine piece weighs 27.79 grams and measures 39 mm. If your coin misses those numbers, be suspicious.
2. The ping test. Real .999 silver produces a high, ringing tone when gently tapped. Fakes tend to sound dull and short.
3. Get it certified. For anything you plan to sell above roughly 50 USD, professional grading by NGC or PCGS is the definitive answer on authenticity and grade.

Mintage and varieties

The exact mintage for this specific variety is not officially documented, which usually points to a limited or set-based release. Collector forums float numbers, but none are confirmed. Since 1978 is the only year of issue, there are no year-to-year variants, though minor die varieties and striking errors can exist and are best confirmed by a grading service.

Where to sell it

For a US seller, your realistic options are:

• Local coin dealers who buy silver. They will pay close to melt for circulated pieces and offer more for certified grades.
• Online marketplaces like eBay, where you can reach collectors directly. Photograph the obverse, reverse, and edge, and list the weight.
• The Pesoteca buy-and-sell forum, where Mexican coin collectors trade and can give you a fair read on your piece.

Because this is a precious-metal coin, only deal with buyers who let you verify weight and see clear photos before money changes hands. Check the price range on this page before you accept any offer.

Have a 1978 Morelos 100 Pesos sitting in a drawer and not sure if it is a common circulated piece or something graded-worthy? Post clear photos of both sides and the edge on the Pesoteca forum and let the community weigh in.