Aaaahhh roight. I know that.

It's upside down. The tubular section would normally contain a float level valve with it being fixed to the face plate.
It is called a Low Side Float in the game. HP liquid come into the small fitting & it's regulated by the float. It expands as it goes through the needle assy in the face plate & becomes Low Pressure liquid.
It's normally flooded with liquid refrigerant Sulphur Dioxide or Methyl Chloride, not usually Freon 12. Not Ammonia because it's probably built from copper or brass.
The number is a S/N & could be possibly a Kelvinator assy.
The float maintains a constant level & is topped up as it boils off.
The slots are for ice block trays. Fill 'em with water & away you go (in time)

Probalby had a copper door to it.
I would date it 1930 - 50s but possibly earlier into the 1920s.
Hope this helps.

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