Double date on 1979 1 Cent from Canada

Hello,everyone.
How rare and valuable this error can be?

Many thanks :)

From what I've seen and found they are more common and don't sell too much more than a regular graded example.
https://www.coinsandcanada.com/coins-auctions-prices.php?denomination=1&date=1979&details=0&Send=Search here is the auction prices of them, if you scroll down you can see the different varieties of them

Verweis : "FeeFoo"​From what I've seen and found they are more common and don't sell too much more than a regular graded example.
​https://www.coinsandcanada.com/coins-auctions-prices.php?denomination=1&date=1979&details=0&Send=Search here is the auction prices of them, if you scroll down you can see the different varieties of them

The prices on the list are for coins in "mint state".

Verweis : "SRV5490"​

Verweis : "FeeFoo"​From what I've seen and found they are more common and don't sell too much more than a regular graded example.
​​https://www.coinsandcanada.com/coins-auctions-prices.php?denomination=1&date=1979&details=0&Send=Search here is the auction prices of them, if you scroll down you can see the different varieties of them

​The prices on the list are for coins in "mint state".

​yes and the prices are for graded mint state