Greetings Trevor,
The arms in question (horn with stars) apparently belonged to a Pezet de Corval line in the Normandy region of France. I am not well versed in their genealogy or history. However, I have some information and suggestions. First check out the Ancestry.com board on coats of arms, where some years ago, this specific subject came up. Hopefully, this link will work for you:
http://boards.ancestry.com/topics.heraldry/578/mb.ashx?pnt=1Otherwise, you could get there via - Message Boards > Topics > Coat of Arms & Heraldry > Pezet Coat of Arms
I posted a very short item on that board about the Pezet de Corval from a book written in Spanish in the 1960s by a relative called the Pezet in Peru.
As for Pezets from the Channel Islands, I believe some members of that clan have posted to this Pezet board in the past and they may be able to help you.
Ancestry.com also has an entry in German from Siebmacher’s Wappenbuch which shows a different blazon (arms) for the Pezet de Corval with a text description. I've attached that to this post in case you want to try to translate the German.
Good luck in your investigations and please share any findings you make with others who may visit this board.
Regards, Peter