It's a slightly different David Tennant Treat 4 Today as this is an item which was sold recently on eBay as a Life Cast Life Mask of David Tennant.
The description says:
'It was created for special effects purposes and captures every detail of his face (wrinkles and pores,etc)
It is made of sturdy lightweight fibreglass plastic ,painted white and supplied with a wire loop on the back so that it may be hung on a hook on the wall for display.'
It sold for $102.50 after only 4 bids.