Brett2444 Of course this is special because it belonged to your grandmother It looks like it has been polished and that ruins any numismatic value that this coin would have had, But it was your Nan's so its value to you would be priceless
I would grade your coin as aVF, hard to see from the photos but I think it is an overdate. Even cleaned it would be worth $12-17. I note that it looks like someone has taken a wire brush to it at some point.
Hare to tell if its an overdate but there is does look like there is a little spike from the end of the top stroke so it might be.
You can tell its been polished because of the colour. For a coin in this grade and of hat age you wold expect it to be somewhere from milk chocolate brown to dark chocolate brown. Yours is veryb coppery looking which is a give away its been cleaned.
Us coin collectors dont like our coins cleaned. Even if it is an over date I wouldn't think it would get anymore than $10 on eBay.
My advice would be to keep it because its your Nanna's and is special. Is this the year she was born?