Could I Please start this post by saying what a fantastic resource this website is. The coin here is a 4 pence Groat, I think it is UNC it is a fantastic looking coin.
I have almost NO experience with UK coins, but I wonder if this is not a Maundy coin, I have seen some that looked like this, in silver. Also, I could be wrong, but it does not look UNC to me – some loss of luster seems to be apparent.
As someone else said in another of your threads, please post pics of both sides of your coins, especially when you are asking about grade or value. It's difficult enough to grade from a photo, let alone from only one side. Also, please specify if you are posting photos or scans, which can make a big difference when you are trying to determine the amount of lustre on a coin.
It is indeed from a maundy set and can correctly be called a groat as well - Krause does. This example I would say is worth about $10 - $15.
