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The Salter pocket letter scale of 4 oz. capacity is described already at 4 oz. More information about Salter is given there. Also the existence of a two springs version of the 4 oz. Salter is mentioned at that page. The Salter pocket scale presented here is such a two springs specimen. The chart has the Inland English postal rate for letters valid in the period May 14 1923 till May 1 1940. This letter scale was delivered in a green pouch with the gold imprinted text: Letter Balance. During the years Salter made a lot of different letter clips for this type of letter scale. Below some more pictures of this letter scale.
