Maker's Name: 
Willard Storage Battery Co., Cleveland, Ohio, USA
Where made: 
circa 1927

The Willard Colloidal Rectifier has two electrodes, one aluminium and the other probably lead, immersed in a solution of ammonium phosphate with other chemicals to optimise the process (see patent).

This one has never been used so that a sample of the chemicals are still in the original paper bag inside the glass container.

These rectifiers were used, connected directly to 110VAC  mains, for charging 'B' (typically 90-135V) batteries for radios.