I think mine is in a box somewhere in my garage right now - preparing to move house, but from my post of 4 years ago I wrote that it was 18" tall and 5.5" wide.
Interesting what you say about a stopper Keith. I hadn't noticed any sign of a stopper mark on the rim of mine - I must look again when I've moved and unpacked, likely to be months down the line I suspect.
Cheers, Iain