A small quantity of British and Polish medieval coins

A small quantity of British and Polish medieval coins, including; King Sigismund III, 1587-1632 AD, Grosz, very fine; Johan Casimir, 1649-1668 AD, 6 Groschen, very fine; Elizabeth II, Halfcrown, 1967, (S #4145), very fine (3); Elizabeth II, Halfcrown, silver, 1961, (S #4145), very fine (1); Elizabeth II, copper-nickel, 50 pence, 1998, National Health Service, rev. radiant hands within circle, (KM #996), extremely fine; Elizabeth II, copper-nickel, 50 pence, 2000, Public Library, rev. open book above building, CD's in pediment, (KM #1004), very fine, (2); Elizabeth II, copper-nickel, 50 pence, 1998, 25th Anniversary - Britain in the common market, rev. bouquet of stars, (KM #992), very fine; and others of varying grades. [qty]