Double strike error?

2 posts
There a a few Paraguay 1 centésimo 1950 on sale Eminem eBay as a double strike error coin.
With a friend we checked more than 50 and 90% have some degree of doubling.
Can a so common issue be considered as a error?
I'm adding 2 pictures of random pick of my coins
Sorry no Swaps. Paraguay Post Office is to risky and they don't allow to send coins nor notes
The correct term would be Doubled Die, and because the error is on the die, you can have a huge number of them produced. This coin is Double Struck:

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