Thanks for this.
A guy from Ireland was clearing out his father's shed, and came across this cylinder head.
As his father used to own a Comet many years ago, he though it could be worth millions of pounds (having come off something that originated in Stevenage!).
When he sent me the photo, I told him that it wasn't off a Vincent, but that I would post the photo here on our forum to see if anyone recognised it.
I'm sure he's going to be incredibly disappointed to learn that he can't retire early!
Such is life!