1812 Mexican 8 Reales Silver (Independence War): Value Guide

Most old Mexican silver coins are worth their metal plus a modest premium. The 1812 8 Reales from the War of Independence is different: depending on the issuing authority, grade, and whether it is a royalist strike or a scarce insurgent piece, values run from roughly 100 USD to several thousand for the rare types. Here is what actually drives the number.

What you have

An 8 Reales was the workhorse silver dollar of the Spanish colonial world, the most widely circulated trade coin for centuries, and the direct ancestor of the US silver dollar. A piece dated 1812 was struck in the middle of Mexico's War of Independence, when control of the mints shifted between royalist forces and insurgents. That backstory is exactly why some 1812 pieces are common and others are genuinely rare.

Specifications (verify yours against these)

Spec	Value
Metal	Silver, .900 fine
Weight	20.15 g
Diameter	37 mm
Edge	Plain (no lettering or design)
Catalog reference	KM#234a

Grab a jewelry scale and a caliper. If your coin does not land near 20.15 g and 37 mm, treat it as suspect until proven otherwise. Silver counterfeits of colonial 8 Reales are common.

Why the value swings so much

Three things decide what a genuine 1812 8 Reales is worth.

1. Who struck it. The standard royalist Mexico City (Mo) issues from 1812 are the most available type. These trade largely on silver content plus a collector premium: think roughly 40 to 150 USD in worn condition, more in higher grades. Insurgent-produced pieces, including the crude cast and struck coinage tied to figures like José María Morelos (the SUD provisional coinage), are far scarcer and can bring several hundred to several thousand USD when authenticated. A cast Morelos SUD piece is a different animal from a machine-struck Mexico City dollar.

2. Grade. Colonial silver saw heavy circulation. A smooth, low-detail example sits near the metal floor. A sharp, lightly worn coin with clear devices commands a real premium. A certified Mint State example is rare and sells for a multiple of a circulated one.

3. Authenticity. Because these coins carried real bullion value in their day and are widely faked now, a genuine, verifiable piece is worth far more than an unverified one. Third-party certification (NGC or PCGS) closes that gap.

Realistic value ranges

Type / condition	Approximate value (USD)
Common royalist Mo 8 Reales, heavily worn	40 to 90
Same, sharp / lightly circulated	100 to 300
Certified higher grade, common type	300 to 1,000+
Insurgent / Morelos SUD provisional (authenticated)	Several hundred to several thousand

These are working ranges. A precise figure depends on the exact type, mintmark, assayer initials, and a look at the actual coin. Do not assume the top of the range; most surviving 1812 dollars are common circulated royalist pieces closer to the bottom.

The myth to ignore

"It's from 1812, it must be worth a fortune." Age alone does not make a coin valuable. Millions of 8 Reales were struck over the colonial period, and the Mexico City mint was the most prolific producer in the world. A worn common example is worth its silver plus a small premium. The money is in the scarce insurgent issues, high grades, and verified authenticity, not the date on the coin.

How to check what yours is worth

1. Weigh and measure it. Confirm 20.15 g and 37 mm. A big miss on either is a red flag.
2. Read the details. Look for the mintmark, the assayer's initials, and the style of the engraving. Cast surfaces (grainy, soft, with a seam on the edge) point to either a genuine insurgent cast piece or a fake, and telling them apart takes an expert eye.
3. Photograph obverse, reverse, and edge in good light. The edge matters here (it should be plain).
4. Get a second opinion before selling. For anything you suspect is an insurgent or Morelos piece, certification pays for itself.

Where to sell it

Sell where the buyer shows you the coin and its weight before money changes hands. A verified numismatic shop from the Pesoteca directory will appraise it on the spot, and the Pesoteca buy-and-sell forum puts you in front of collectors who know these types. Post clear photos and the weight, and check the range above before you agree to a price. Do not dump it to the first buyer on social media.

This 8 reales silver piece corresponds to 1812, in the thick of the Morelos phase (military ascent) of the Mexican War of Independence. In 1812 José María Morelos consolidated his military leadership with the siege of Cuautla (February to May), where he held out for 72 days against Calleja's army before breaking the encirclement. That year also saw the promulgation of the Constitution of Cadiz under Viceroy Venegas.

The piece does not declare a specific mint in the slug. During the war, pieces from the central mint of Mexico circulated alongside provincial royalist issues (Chihuahua, Zacatecas, Durango, Guadalajara, Guanajuato) and insurgent ones (Zitacuaro, Sultepec, Chilpancingo, insurgent Oaxaca). Issuing faction: undeclared. The silver fineness was 0.903 and the theoretical weight 27.07 grams, within the eight-real system inherited from the viceroyalty.

The 1812 issues are marked by the promulgation of the Constitution of Cadiz, which temporarily reformed the political framework of the Spanish empire. Pieces from that year are sought for their Cadiz constitutional theme.

In the numismatic market they are sought by collectors of military history and the nation's origins. When buying piece by piece, verify the authenticity of the planchet and the declared mint. Many common pieces are sold as "war rarities" without being so: consult the Krause reference before accepting a dealer's markup.