Wahl Eversharp introduced the Skyline in 1941 and they were very popular. They were advertised as being leak proof on airplanes at the same time that air travel was becoming common place. The design is quite distinctive and the tapered end makes them fit nicely in your pocket. Eversharp made excellent nibs and the ones that are fitted in Skylines are some of the best. This makes these pens a nice choice for a vintage pen to use on a daily basis.
The shape of the body of these pens reduces the size of the ink sac. The pens do not hold a great deal of ink but it is adequate for most purposes. The taper on the pen body allows the cap to fit about half way up the filling lever when it is on the back of the pen. Brassing is very common in the center part of the filling lever. The early models had problems with shrinkage of some of the plastics. This shows up in loose or missing top derby's and loose metal overlays. Both repairs are simple but replacement parts are frequently needed.