Hello there i picked this up today on the 10p shelf, it looks very well made hand blown with a polished pontil and deeply engraved, it also has two black seeds within the glass, i'm thinking it a shot glass as it's only small, i know Whitefriars were crazy on prunts but i have no idea who has made this. It's 3 1/4 inches in height 2 inches across the rim and 1 1/2 inches across the base with a nice ring to it for it's size.