Mexico 500 Pesos 1986 (Cupronickel): What It's Worth

If you inherited or found a Mexican 500 pesos coin dated 1986, here is the honest answer: it is not silver, and in ordinary condition it is worth roughly 1 to 5 USD. The high face value fools people. This was old-peso currency from before Mexico dropped three zeros in 1993, so 500 pesos then is not what it sounds like now.

Quick answer: is it worth money?

The 1986 500 pesos is a cupronickel coin (a copper-nickel alloy, no precious metal), so it has no melt value to speak of. Value comes entirely from condition and collector demand. Circulated examples trade for about 1 to 3 USD. A crisp uncirculated piece, or one still in its original Banco de México (Banxico) blister pack, can reach 5 to 15 USD. That is the realistic ceiling for a standard coin.

So if you were hoping a "500 pesos" coin meant a small fortune, it almost never does. The exceptions are genuine mint errors, which we cover below.

What you actually have

This is a standard-issue circulating coin from Mexico's old-peso era, minted at the Casa de Moneda de México (the Mexican Mint). The mint mark "Mo" appears on the reverse.

Specifications

• Metal: Cupronickel (copper-nickel, not silver)
• Weight: 12.69 grams
• Diameter: 28.43 mm
• Edge: Reeded (grooved)
• Era: Modern Mexico, pre-1992 (old pesos)

Obverse (front): The Mexican national coat of arms, an eagle on a cactus, with the legend "ESTADOS UNIDOS MEXICANOS" (the official name of Mexico, United Mexican States).

Reverse (back): The face value "$500," the date "1986," and the "Mo" mint mark.

Value by condition (grade)

Condition is what separates a 1-dollar coin from a 15-dollar coin. Collectors grade coins on wear, luster, and strike quality.

These are typical collector-market figures. If you want to confirm your coin's grade, use our coin grading guide to check it against your piece.

The one thing that could make yours worth more

Genuine minting errors (off-center strikes, die rotation, double strikes, or known die varieties) can multiply the value of an otherwise common coin. That is the real long shot here.

A warning, though: most "errors" people post online are not errors at all. They are post-mint damage, such as impact marks, corrosion, or scratches from decades in circulation. A true factory error happens during striking and looks consistent, not like random damage. If you think you have one, photograph both sides plus the edge and post it in the Pesoteca forum so collectors can weigh in before you get your hopes up.

How to tell if it's genuine

Fakes of a low-value coin like this are uncommon, but here is how to check:

1. Weigh it on a jewelry scale. It should be 12.69 grams. Off by more than a few tenths and something is wrong.
2. Measure the diameter with calipers. It should be 28.43 mm.
3. Inspect the strike. Genuine coins have crisp, raised relief. Flat, mushy detail or uneven color is a red flag.

Counterfeits usually miss on weight, diameter, or the sharpness of the design.

Where to sell it

Because the value is modest, your goal is a fair price without getting lowballed:

• A verified coin shop in the Pesoteca directory can appraise it on the spot, sorted by city.
• The Pesoteca buy-and-sell forum connects you directly with collectors, no middleman markup.
• If it is a common circulated example, honestly, it may be worth more as a keepsake than as a sale.

Before you sell anywhere, photograph the obverse, reverse, and edge, and check the grade ranges above. Do not dump it to the first buyer who messages you on social media.

Have a 500 pesos 1986 that looks unusual, or a whole box of inherited Mexican coins you can't identify? Post clear photos in the Pesoteca forum and let the community tell you what's actually worth setting aside.

Mexican circulating peso coins from the second half of the 20th century were struck in alloys that changed according to metal costs and inflationary pressures: .720 silver in the $1, $5, $10, and $25 denominations during the 1940s-50s; cupronickel from the 1970s onward; aluminum bronze and stainless steel in the 1980s; pieces featuring historical figures (Hidalgo, Cuauhtemoc, Juarez, Madero, Carranza, Sor Juana) in the late 1980s, just before the transition to Nuevos Pesos in 1992. 1986 corresponds to the period when this variant was in circulation.