Antique Mercury Glass Bottle Decanter Shell Shaped Stopper 14" Tall

Antique Mercury Glass Bottle Decanter Shell Shaped Stopper ~ Coined poor man's silver, this decanter was purchased in an antique store many years ago. It features a shell shaped stopper and has a tall stature of 14" including the stopper. Deep punt bottom. There are no hallmarks nor pontil mark. I believe this is an antique mercury bottle as if you place a rod (pen or toothpick) on the mirror. If the point touching the mirror looks like it is directly ``touching'' its reflection, the glass layer is thin enough and the mirror is probably modern. On the other hand, if the point is separate from its reflection (see pic), then it is probably mercury (prior to 1832). Measurements: Full height 14" tall; Bottle height 11"; Full length of stopper 4.75"; Base diameter is 4.5" For it's age it is in very good condition with mottled silvered mercury finish~ Comes from a pet-free and smoke-free environment.