QUOTE(Ian @ Jun 6 2006, 12:23 PM)
I'm not sure of its actual denomination but I suspect that its a `grosz'
I think this is 1/2 Grosz.
I have a catalogue by Z.Klimek of Polish coins between 1506 and 1795. It starts with a period of Sigismund I who ruled right after Alexander. Under Sigismund I coins with eagle on Av. and crown on Rev. were 1/2 Grosz. Design for Grosz was different.