Simplex Sigulllim Veritas.  I bought this in Nepal in 2002. It functions beautifully, is made from the simplest of materials and costs virtually nothing to manufacture.  A bolt, two nuts and a scrap piece of wood.  But the man I purchased this from specialized in making or reselling these- he had hundreds, and it was a very common item in restaurants.  To use it, it is turned upside down and the the bottle cap inserted at the end,then the head of the bolt lifts the bottom it off. I think I paid about 5 cents for it and it even comes with a hang hole.
Peachey Conservation 