Medieval Silver Coin [решено]

I really want to get this off my desktop before The Abbinator decides to claim it for her collection but I'm having a hard time attributing it. Any help would be greatly appreciated.

Specs: Silver, very thin planchet, 17mm / 0.6 gr.

Looks like a Lituanian or Polish solidus
date (15)98
Top of left picture has the coat of arms of the Wasa dynasty (sheaf of grain)
Sigismund III
https://en.wikipedia.org/wiki/Sigismund_III_Vasa
SIG.....REX POloniae Magnus Dux Lithuaniae

corrections welcome

Thank you Petrusoascanus, I'll try to find it in the catalog under Polish Lithuaian Commonwealth or under each country.

http://fortresscatalogue.com/index2.php?search_request=1598+Solidus&command=first&page_number=0&page=Coins_Catalogue

Цитата: "gdrsb"​http://fortresscatalogue.com/index2.php?search_request=1598+Solidus&command=first&page_number=0&page=Coins_Catalogue

​Thank you, that is a most useful link especially as the website is also available in an English version. I've bookmarked it for future use.

I've repaid the excellent help received by adding this coin to the Numista catalog and it's now pending validation.