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2000 struck through grease unique 1 Quetzal

How to price an error coin f you cannot be based on other prices since is unique? This Guatemala 2000 one quetzal is missing all this "de diciembre de" supposed to weight 11g but it weights 11.23 grams
Is a little lighter in color than others.i don't know much about quetzales.i appreciate any information that can help me on what would be the value of this coin without grading(other than just writing"face value") thanks
It also has more to it,but cant confirm for now,take a look if you can.
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Answers
While I cannot contribute to the answer you are seeking. I thought I'd comment on the excellent photographs an detailed focus points and description. Hopefully someone will be able to provide your answers.
Estimating a value can be difficult for minor errors, especially if they are foreign coins. One way is to search the eBay SOLD coins. Since its doubtful you'll find this specific coin, try to find others with a similar amount of filled die. Not perfect, but might get you in the ballpark.
You also need to considered that the market for foreign errors is much smaller the U.S. Errors. Unless you find something dramatic, it probably would be hard to find someone interested in buying it.
Finally, the condition of your coin is pretty bad. Lots of digs and rim dents. IMO, the value would be the same as most common world coins that you would find in a 4/$1 box at a coin store or show. Still an interesting find, just not something that collectors are interested in paying a premium to own