I got these in a lot at an auction and have had trouble finding any information on the first 2. From what I have seen I believe the last one is an Irish coin. Any information would be helpful. Thanks.
The last one is definitely Irish, and ca. 1806, as mentioned, but I think it could be a farthing rather than a halfpenny. How big is it? Closer in size to a US cent? That would be a farthing. Bigger than a quarter but not quite half-dollar-sized, that would be a halfpenny.