Makes me wonder how they put that stopper together, with it in the bottle? Or did they just lube it up and shove it thru?Albert Albertson invented the gravitating stopper and sold the rights to John Matthews. Patented Oct. 11, 1864. I have seen a number of Gravitating stoppers bottles before, but not many with the complete stopper. It is a 2 inch long glass stopper with a rubber gasket on the end. It was filled upside down. This one is a California. Billings of Sacramento Cal. Hope you enjoy.