An American glove mould,made in Trenton New Jersey and designed for making rubber gloves.
There are two here to choose from ($85 each) one with 1991 stamped at the bottom and June 1996 on the other.
They are made for a large hand size.
Approximately 300mm high,good vintage condition with some latex residue around the base,easy to clean up if desired.
There are other shapes and sizes at the shop currently too.