Your coin, without guarantee:
・IOH・ADOL・D : G・DVX・SLS・
Johannes Adolphus Dei Gracia Dux Sclesvicum
John Adolph by the Grace of God, Duke of Schleswig
MONETA・NOVA・SCLES・603
Moneta Nova Sclesvicum 1603
New coin of Schleswig
So if the date is really 1603 it is either missing from the list or another type.