That is a glass decanter. Basically a wide bottomed glass bottle with a glass stopper and a pouring lip. It is commonly used for fortified wines like port or sherry which do not oxidise quickly in an open bottle. The decanter is filled from the original bottle and kept on the table or sideboard. The host may serve from the decanter or at dinner the decanter may be passed between guests to serve themselves. The wide bottom is to prevent it being easily knocked over by the drinkers. The pictured one has a glass handle but many have no handle.

They are in common use.