Rare Coins

So, i've been doing a bit of a 'spring clean' during the summer. Amoung the many things i've held onto are some coins. I remember when i was around 11 my next door neighbours took my brother and myself to the Millenium Dome. When we were there we bought an ice cream and this man handed some change to me. He said hold on to that one (indicating to the 50p) because it will be worth around £10. So i did.

This 50p has dolphins on the back, which is why im guessing it's supposedly rare.



I've done some rare coin hunting and the highest it will get me so far is £2.95. But i did find one bid that has now dissapeared that was a whopping £6.99! I'm thinking if i hold on to it long enough, one day it might pay for my tuition fees.
I had some other 50p's i thought had the same 'rare factor' but thanks to wikipedia it turns out they're not http://en.wikipedia.org/wiki/Fifty_pence_(British_coin)