I don't know if there are many, or any at all! On the front cover of Spink 2004, there is a picture of the ex. Slanley Charles I Exeter Halfcrown dated 1642, which looks like a GEF/UNC to me.
If you think about it there must be some hammered coins which have not been put into general circulation, the trouble is they are usually worn from being in the ground for hundreds of years.
It's in his printed catalogue as well. I meant to ask him about it. In the immortal words of Lady Bracknell, I have known errors in that publication. For ages he had Queen Victoria down as 1937-1901 and I've reminded him that Edward VII's wife wasn't called Alexander He is very careless sometimes considering he has a smaller army of I.T experts on his team!
I have been collecting for 9 years and I am only 15. I started off collecting when my Grandfather gave me a bag of some predecimal coins which he saved when the decimal system was introduced. They were all circualted when I got them but I didn't care when I was 6!