40 Frank expo

beste wie kan mij hier iets over zeggen ook eventueel een richtprijs is ook een slag fout aan de rand

Hello. This is a pattern coin. There are many versions. There are four in the Numista catalog.

N#18907

N#318958

N#318956

N#318959

SCWC lists numerous others.

It would help is you knew what the edge looked like and the material.

gekartelde rand 

Doesn't look like gold. I would suggest you send it in to get it identified and authenticated.

is een zilveren 

Then probably this one N#318958

ja klopt maar mijn met een slag fout 

The only auction I found was this one with a starting bid of €6000. I don't have a premium account so I can't tell the final value.  Maybe @tdziemia can?  https://www.acsearch.info/search.html?similar=926347

By chance, this is your coin, so you  know exactly what it sold for recently: https://www.numisbids.com/sale/8999/lot/?lot=996