Young collector need help

[Antonion321]

Hello, I have a friend who occasionally metal detects. He has found so many coins over the years and would like to sell them. Can you tell me how much these coins are worth and where is the best place to sell them? I took a couple of better photos, but I can take more if needed.🙂
Thank you

[John Conduitt]

Where were they found?

[Spargrodan]

The pictures are difficult to read, but they appear to be Swedish copper coins. I believe the coins on picture 2-7 are from Queen Christina of Sweden; the obverse displays the Wasa emblem in the shield, while the reverse has a "C" for Christina. 8-9 is her cousin, Charles X Gustav of Sweden, who became regent after Christina's abdication 1654. The reverse features a "G" for Gustav and obv. a Lion instead of the Wasa emblem.

In general they are very comon, usually comes in this condition and maybe could sell for around 10-50 EUR/ coin?

It would help to identify the coins with a bit clearer pictures.

[sand]

Hello @Antonion321. Welcome to Nvmis Forvms.