Today, I attributed a coin that I had never seen before now. It is an Irish groat of Philip and Mary, 1555.
According to Coincraft, this type, and the similar shilling, are the first Irish coins with dates in Arabic numerals.
Here are photos of the coin:
http://www.elfreeman2.com/t20/mir55o.jpg
http://www.elfreeman2.com/t20/mir55r.jpg
The weight of the coin is 2.7 grams.
I have submitted the data for inclusion in the Numista catalog.
Regards,
Eugene