VINTAGE 1940's Japanese Brand JUMBO Urushi Ebonite 14K EF Nib Fountain Pen WITH THE ORIGINAL BOX!! I have been watching other listings for quite awhile and have not seen one with the original box.
This is a used pen, not restored. Please view pictures carefully as it's part of the description. Stubby oversize novelty pens were a popular pre-WW2 import item in the United States from Japan -- so popular that they can still be found in plentiful supply and at modest cost. Most Jumbo pens are flat-top eyedropper-fillers, but one also will find lever-fillers, rounded ends (cigar-shaped), and combos.
Some examples may be postwar, but the great majority are prewar. Jumbo pens are popular before World War 2 because of the benefits of writing with Jumbo pens. Writing on jumbo pens gives more stability and comfort to people with hand tremors and other medical issues.
The Japanese developed a unique "fat body" design, which actually had a simple reason behind it. During that time, computers were not yet available, and people with arthritis found it easier to hold a larger and thicker writing instrument. These pens were primarily exported to the United States and Great Britain, although they were also occasionally found in Europe, albeit less commonly. In the third scenario, the majority of these pens were available in the eyedropper format, which had been featured in distributor catalogs since the 1930s.