1 Onza (Pattern; Monarch Butterfly) ND
| Gold (.999) | 21.25 g | 34.5 mm | 
|   Issuer   |  Mexico | 
|---|---|
|   Period   |  United Mexican States/Mexican Republic (1823-date) | 
|   Type   |  Pattern | 
|   Currency   |  Bullion coinage (1947-date) | 
|   Composition   |  Gold (.999) | 
|   Weight   |  21.25 g | 
|   Diameter   |  34.5 mm | 
|   Shape   |  Round | 
|   Technique   |  Milled | 
|   Orientation   |  Coin alignment ↑↓ | 
|   Demonetized   |  Yes | 
|   Updated   |  2024-10-06 | 
|   Numista   |  N#377774 | 
|---|---|
|   Rarity index   |  100% | 
Reverse
A monarch butterfly in the center, with the fineness below, mintmark to the right, and weight and material at bottom.
Script: Latin
 Lettering: 
 MONARCA 
 .9999
 Mo
 UNA ONZA ORO PURO 
 Translation: 
 Monarch
 One ounce of pure gold. 
Edge
Plain.
Interesting fact
The Pattern 1 Onza coin featuring the Monarch Butterfly design from Mexico is a unique and interesting collector's item. One fascinating fact about this coin is that it contains 21.25 grams of .999 pure gold, making it a valuable and sought-after piece among numismatists and gold investors.