Antique Measuring Instrument Collection - Full Circle Letter Scale

The maximum capacity of this scale is 500g. According to this page, this type of letter scales with the distinguishing full circle weight indicator is a design of Balduin Heller's Söhne. A number of patents were granted to this design in several countries, including Germany (DE254082), Austria (AT61166), Hungary (HU56898). All these patents were granted no later than 1912, but the patent for the design of the more robust frame of this example was granted in 1922.

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