Help with identifying hammereds

[bigjerryok]

I have three hammereds. The tiny one is a King John, and easy enough to ID once you know what you are looking for. Any ideas on the other two though? I think the big one is a groat. The medium one is bent over.

 

[Silver Searcher]

The large one looks like a Half Groat/Groat depending on diameter.....of Richard?, the bent one is a Edward1st penny, and the last one you say is John, well it's a Irish hammered penny of John then.

SS

 

[bigjerryok]

Thanks SS. The large one is 2.5 cm across. Doing my head in trying to identify it - every time I think I have it, I think - No, it's not that, and the writing isn't quite clear enough (or I don't know what I'm looking for). The tiny one is just over 1cm across, you can make out the bearded image of John - actually a silver halfpenny I think - John as King Halfpenny of Dublin - Roberd. Really appreciate your help!