My ThreePence has bumps on each side? :L

The picture is too small to be 100% sure but it is almost certainly solder from an old pin attachment.

Thanks for you're replies :)

As you can probably tell, I'm quite new to collecting coins. I've just started metal detecting with a friend of mine.

Looks like it could have been mounted as jewelry at some stage.
The bumps are probably bits of solder

I recently saw for sale a silver 3d with a small hole bored through just above Victoria's head, which makes me think it was once worn on a neckchain or bracelet. ( Shame to do this to such a nice coin !).

Apparently wearing coins as jewellery is not new. I recently read that in mediaeval Venice, Italy, Zecchins were sometimes worn on women's clohing, from which we get our word "sequin".