Because it blew off in a storm and was picked up by a sentinel guarding the Exchequer's Office, who hid it up his chimney until he died. From there, it appears at various points in history until someone returned it to Sydney Sussex College, Cambridge, where it was buried in an unmarked grave.
It passed through private hands and different exhibitors hands for almost 200 years and yes, I believe it was displayed in a few museums in that time period. However, it was passed into the hands of Oxford college who conducted a full investigation of it's origins and concluded that it was indeed the actual head, and was buried there in 1962. So no, it is not on display now. MORE His death mask is in the British Museum. I was surprised at the number of scars on his face.
You have a bad or missing ground.
Oliver Cruz goes by Oyi.
Oliver Skan goes by Smellyskanners.
Oliver Stokes goes by Ollie.
Oliver Zahle goes by Olli.
Oliver Riedel goes by Olli.
Oliver Ackland goes by Oli.
Oliver Brookes goes by Olly.
Oliver Pigott goes by Ollie.
Oliver Newell goes by Sparkles.
Oliver North goes by Ollie.