Unknown coin , German ??

[pinpoint]

Friendly ask for help to determine this unknown coin.
Perhaps German ?
Coin found in The Netherlands , 28 mm , 1,55 gr. / Silver
Legenda on double eagle site : MONETA NOVA ...... LENSIS
On the rev. site is a little 'Gegenstempel" : flower
Any info is welcome

Greetz from The Netherlands , Pinpoint

[pinpoint]

Coin already determinated as Dutch coin

Dubbele Groot , Arnold ( 1423-1473) , Graafschap Gelderland
Minted in Arnhem
Ref.nr. : vd Ghijs , Gelderland , Plaat XI nr. 18

Greetz , Pinpoint