1939 Model 200 Flash A Call inter-Communication System.  Excellent original condition, video included of unit operating  I haven't tried to wire it up to the different terminals but the tubes light up and it acts like it is operable as illustrated in the included video.  .  Photos included of both front and back of the speakers as they look the same from each side.  Original finish and decals, a bit of a time capsule, original knobs and back cover.  A nice example of pre-WWII Americana:  Info and photos below from the Radio Museum:

• Country
• United States of America (USA)

• Manufacturer / Brand
• Inter-Communication System (Flash-A-Call); Chicago Ill.

• Year
• 1939 ?

• Category
• Miscellaneous (Other, Various) - see notes

• Radiomuseum ID
• 171268

• Number of Tubes
• 2

• Valves / Tubes
• 
  

• Number of Transistors
• 
  

• Semiconductors
• 
  

• Main principle
• Audio-Amplification; 2 AF stage(s)

• Wave bands
• - without

• Power type and voltage
• AC/DC-set / 120 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm

• Material
• Wooden case

• from Radiomuseum
• Model: 200 W - Inter-Communication System

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Dimensions (WHD)
• 295 x 210 x 165 mm / 11.6 x 8.3 x 6.5 inch

• Notes
• Intercom with 10 station positions.

• Author
• Model page created by Stuart Irwin. See "Data change" for further contributors.