Continuing on the (now vintage pens!) Esterbrook trend! For the traveling sales person, Esterbrook had handy cases with slots for various Esterbrook pens (such as the lovely pastels), along with smaller slots across the top for nib units, with corresponding numbers. There was also a nib selection chart with writtng samples tucked into the case. With so many nib units to choose from, it only made sense to carry a selection of pens and nib units for potential customers. I can think of a few people who would probably enjoy this for personal use!