Mexico Proof Pattern Overstrike Errors
On 1980 1 Onza Libertad Silver Bullion Coinage
PCGS PR 68
On 2008 1 Onza Libertad Silver Bullion Coinage
PCGS PR 67
UNIQUE SET
$7,500

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This is a unique, incredible and dramatic set of proof pattern overstrike errors. In 1990 the Mexico City Mint struck a new 100,000 Pesos Proof Pattern coin. It was struck in bronze with an extremely low mintage of 223, and is KM-Pn245. There are also a few known that were struck in brass, silver, aluminum, and lead.

This set is unique because it contains the only two known 1990 Mexico 100,000 Pesos patterns overstruck on Mexican 1 Onza silver coinage. The Mexico City Mint struck 1 Onza Libertad Silver Bullion Coinage.

These 1990 Proof 100,000 Pesos overstruck on 1 Onza silver coinage are double denominations with dual dates. The 1980 Onza is KM-M49b.5 and the 2008 Onza is KM639.

This is an opportunity for a mint error collector or a collector of Mexican coinage to acquire a unique and fascinating set of proof overstrike errors.


1990-Mo Proof 100000 Pesos Pattern
KM-Pn245 Var Silver
Struck on a 1980 Onza (cf. KM-M49b.5 for undertype)
PCGS PR 68 Cameo

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1980 Onza

Here is an example of the 1980 Onza (KM-M49b.5).


1990-Mo Proof 100000 Pesos Pattern
KM-Pn245 Var Silver
Struck over a 2008 Onza (cf. KM639 for undertype)
PCGS PR 67 Cameo

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1980 Onza
Here is an example of the 2008 Onza (KM639).



Overstrikes are featured in Chapter 19 of my
NLG award winning book, World's Greatest Mint Errors:


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