It looks seriously like the bottom part of a small dessicator.
This is a bit of lab equipment - dessicating (hygroscopic) crystals are placed in the bottom section and a metal grid sits on the shelf edges above them. Then chemicals which are sensitive to atmospheric moisture can be stored, sitting on the grid. It should have a dome-shaped top, with flanged edges, which fits onto the flat flanges of the bottom part.
A silicon grease is applied to the flanges to create a seal. Quite often there is a neck-section on the top of the dome, into which a rubber bung with a hole in it can be put. If a glass tube is put through the bung, a rubber tube attached to that can then be attached to a vacuum pump and the whole thing evacuated of air.