Very small medieval silver coin id needed

[Richard2]

Hi, a friend has asked where this coin might be from . I’ve exhausted all my ideas ( google images) and was hoping someone here will be able to help. Only about 8 mm diametre . Pictures not that good as taken down the pub . But reverse shows a fleur de lis cross and the obverse has what appears to be a knight with a shield in one hand and sword in the other.

many thanks Richard 

[bagerap]

Are you certain that it is a fleur de lys cross and not crossed keys? Any idea of the metal, because I think it might be an early sack seal, which would be lead.

[Richard2]

Certainly looks like fleur de lis and although I’m not 100% sure it looks to me like silver, very thin as well