Although it is a little hard to tell from the photos I would put it at gF-aVF (im sure somone can translate this to sheldon numbering for me) as I can see substantial wear to the centre diamond, a couple large scratches or dents and some rim nicks.
I clicked on this thread thinking it may be for an Australian 1930 King George V Penny which in a grade like this would be worth easily $20,000. Then you'd be laughing all the way to the bank.