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This accessory is the Taylor Barrett Weighing Machine in green.
All of the features are molded into the metal casting including the two rails on either side of the machine.
This item was released at some time between 1920 and 1940 when the factory was destroyed in an air raid during World War II. The two families split the molds and separated the company in 1945 into two new companies, F. G. Taylor and Sons and A. Barrett and Sons to provide employment for their families after the war.