THE SHORT ANSWER
Normalize both coins by fine-gold content before comparing price or purity
Compare official fine gold, purity, diameter, denomination and transaction economics for the one-ounce Libertad and 50-peso Centenario.
OFFICIAL SPECIFICATION COMPARISON
The Centenario contains more fine gold; the Libertad is purer
| Field | 1 oz Gold Libertad | 50-peso Centenario | How to use it |
|---|---|---|---|
| Fine gold | 1 oz | 1.20565 oz | Normalize melt, ask and bid here |
| Fineness | .999 | .900 | Do not confuse alloy percentage with fine content |
| Diameter | 34.5 mm* | 37 mm | Use as one screening field, not authentication |
| Denomination | None stamped | 50 pesos | Do not substitute denomination for bullion value |
*34.5 mm follows the current Spanish Libertad page and official catalog; the official English page says 34.0 mm.
FAIR COMPARISON
Never compare one coin with one coin
A Centenario naturally has a higher melt value than a one-ounce Libertad because it contains 20.565% more fine gold.
Then compare executable bid per fine ounce, local product recognition, year and condition requirements, and the evidence available for the exact piece. A lower headline coin price says nothing until fine content and costs are normalized.
WHAT CHANGES THE ANSWER
Local spreads can outweigh purity preference
Choose the Libertad when the one-ounce unit, .999 format and its local spread fit the plan. Choose the Centenario when the larger fine-gold unit and local recognition produce better complete economics. Neither answer is permanent: same-time asks and bids can reverse it.
| Question | Libertad evidence | Centenario evidence |
|---|---|---|
| Cash unit | Complete cost for one fine ounce | Complete cost for 1.20565 fine ounces |
| Entry efficiency | Delivered ask per fine ounce | Delivered ask per fine ounce |
| Exit efficiency | Same-product executable bid per fine ounce | Same-product executable bid per fine ounce |
| Product evidence | Year, size, finish and 34.0/34.5 mm source note | Denomination, displayed date, condition and any restrike claim |
| Decision boundary | Prefer the product whose verified unit size, complete spread and local exit fit the stated objective; purity alone does not decide. | |
FREQUENTLY ASKED QUESTIONS
Gold Libertad vs Mexican Centenario questions
Which contains more gold, a Libertad or Centenario?
The standard one-ounce Libertad states 1 fine troy ounce. Banco de México lists the 50-peso Centenario at 1.20565 fine troy ounces.
Which is purer?
The Gold Libertad is listed at .999 fineness; the Centenario at .900. Purity and fine-gold quantity are different fields.
Does the Centenario have a face value?
Yes, it is a 50-peso coin. The Gold Libertad has no stamped nominal value.
Which is the better buy?
Normalize complete delivered cost and bid per fine ounce for the exact products. The answer can change with local recognition, year, condition and spreads.
PRIMARY SOURCES
Official records and a visible evidence boundary
- Banco de México Gold Libertad page: current Spanish series chronology, fineness, sizes and diameters.
- Banco de México official numismatic catalog: BU/PF product labels, dimensions and annual-series context.
- Banco de México Centenario page: 50 pesos, .900 fineness, 1.20565 fine ounces and 37 mm diameter.
Sources reviewed August 12, 2026. Verify current availability, the exact coin and transaction terms. No dealer price, mintage, forecast or authenticity verdict is inferred.