Unknown coins from Poland (Polish-Lithuanian)

Hello experts

I have 2 coin and I think they are from Polish- Lithuanian. The problem for the right identification are the many possibilities in numista.
Is there an expert who can tell me the right catalog number (KM# or Igor#)?
Can you tell me something about quality of the coins and a market value?
The first coin is a 3 grossus from 1595 SIG III, 2.32 gr, round 20.1 mm, mat. silber



The second coin is a 6 grossus in bad condition from 1662 JAN CAS, 3.23 gr round 24.9 mm, mat. silber



A lot of thanks for all the information,
easthook

These are Polish, not Lithuanian. Polish and Lithuanian treasures were separate, and all the Lithuanian coins were different. For example, Lithuanian three-groat 1595 https://wcn.pl/archive?q=1595+wilno+ and Lithuanian six-groat of John Casimir https://wcn.pl/archive?q=sz%C3%B3stak+wilno+ and Your coins https://wcn.pl/archive?q=+1595+Pozna%C5%84+trojak+
https://wcn.pl/archive?q=1662+AT

SIGIsmundus 3 Dei Gratia REX POloniae Magnus Dux Lithuaniae
GROSsus ARGentea TRIPle REGis PO(L)ONIAE
https://wcn.pl/archive?q=1595+polon


GROSsus ARGentea SEX REGis POLoniae 1662
IOAN CASimirus Dei Gratia REX & Sveclae, Magnus Dux Lithuaniae Russiae Prussiae

mintcontractor AT : Andrzej Tymp
(left and right of the coat of arms of the Wasa dynasty: sheaf of grain)
Privy mark : bird on horse shoe ?
https://books.google.be/books?id=PaXoqmbHGyAC&pg=PA690&lpg=PA690&dq=%22gros.arg.sex%22&source=bl&ots=_TMUw4Biog&sig=ACfU3U3P9tjXFuTuLVoWq1EE3rcuXldpcw&hl=nl&sa=X&ved=2ahUKEwjh4PT8u7LmAhVBKuwKHTw_AmwQ6AEwCHoECEcQAQ#v=onepage&q=%22gros.arg.sex%22&f=false