A Venini blue and red hour glass -clessidra.
Venini have been making these clessidra since the 1930's, they are made in a huge combination of colours and sizes in the incalmo technique.
Designed by Paolo Venini. c.1930-50
This one has its original stopper and like the vastmajority of these hour glasses it is not signed but bares an illegible number impressed in the stopper.