I want to buy

Mai I know the price and picture?

Numista is a reference site. It isn't a place to purchase coins.

See: https://en.numista.com/help/can-i-buy-or-sell-on-numista-7.html

I don't understand the Numista system definitions - buying or selling coins.
The mentioned system does not exclude the purchase of coins.

Here's an example:
I have a $10 coin in my listing. In the description, I state that it has a collector value of $20.
If I agree with the buyer on an exchange for a countervalue, I am effectively selling the coin.

It is an agreement between two partners, two collectors.
And outside the Numista system? Via email.

For example, I had a buyer who selected coins worth tens of euros from my offer, but he did not have
an adequate countervalue in his offer. Or one did not even offer coins from his own country.

Cebo58

I don't understand the Numista system definitions - buying or selling coins.
The mentioned system does not exclude the purchase of coins.

Here's an example:
I have a $10 coin in my listing. In the description, I state that it has a collector value of $20.
If I agree with the buyer on an exchange for a countervalue, I am effectively selling the coin.

 

It is an agreement between two partners, two collectors.
And outside the Numista system? Via email.

 

For example, I had a buyer who selected coins worth tens of euros from my offer, but he did not have
an adequate countervalue in his offer. Or one did not even offer coins from his own country.

 

Numista has no coins listed for sale, and doesn't purchase coins. Numista helps facilitate exchanges between users ("swaps") but Numista doesn't set the price and doesn't handle any any of the exchanged items.

Also have you read the forum policy (rules 11)?