1953 Model RS with box, check weights and oil bottle. Webster had a habit of gluing the instructions inside the box lid so keeping the box is imperative.
Webster began offering reloading scales in 1952 after getting a patent for their balance design. They had four separate models, the RS being the only substitution weigh model. While this is supposed to be an excellent system for precise weight it takes the patience of Job to get it zero'd. There are four adjustments, two for weight and two for swing sensitivity. It did not stay on the market long.
Ken