Hi Nic,
Thanks for that. I should add that I bought this decanter in a Flea Market in Fuengerola on the Costa del Sol for 5 euros last month. During my search of the site I saw other 2 tall larger decanters typical of the true kluk kluk individual chambered examples mentioned and both had the flat stopper. They both carried a high price of around 50 euros so I quickly moved on!
Bryn