found me this thing with a fleur de lis.
it's made of cupper, and it is not total flat.
i think it could be the above part of a 2 piece button.
as it was found on a spot where french fought next to the dutch (also found dutch) in 1940 against occupation it could be of a french army button.
but it also could be something boyscout ......
searched much, but can't find a determination myself.
does anybody recognise? got references for me?