Westclox introduced "Wrist Ben," their first wrist watch, in 1936, and a modified version in 1939. New Wrist Ben (curved to fit the wrist), was introduced in 1950. The above cases are tonneau shaped.
In 1956 the Wrist Ben was redesigned as a round watch.
Only the 1950 model (style 3) says "Wrist Ben" on the dial, the others say just "Westclox".