England 1966 World Cup Memorabilia?

My Grandma and Grandad own a money box saying England World Cup 1966, it is in the shape of a football and brown. They say it is very rare. I cannot find it anywhere on the internet to see how much it is worth. Does anybody have any ideas? It is not the Willie money box as I presume that would be in the shape of the lion? If anybody could help or anybody has any links that would be great! Please Help =D