This featured series is an import by Lego from Japan, circa 1950s-60s. It consists of four sets of children dressed as various occupations.
Police Officers
Postal Workers
Each set stands about 3.75'' in height and have 3 and 2 pour holes. Irene Thornburg initially depicted this series in her book entitled Collecting Salt & Pepper Shaker Series on page 119.
Firefighters
Doctor & Nurse