Seems to be glazed over a concrete style backing with possibly a framework to hold the piece in place for the glazing process. That said I don't really have a clue!
Would prefer this item was collected but can deliver at cost up to 100miles from SN4 0AU. Will post further afield using courier or similar if required. More pictures to be added next 48 hours. This item is in the category "Collectables\Breweriana\Guinness Collectables\Guiness Advertising". The seller is "allandsundries73" and is located in this country: GB.
This item can be shipped to United Kingdom.