The Kaweco Sport is the perfect pocket fountain pen to bring around town. Its aluminum body gives it a nice weight while also being of small size. Kaweco's nibs are on the broader side and incredibly smooth to write with. Posting the cap adds extra length, or use it without the cap. Takes international cartridges, or a Kaweco mini converter. 

May be available in other nib sizes, call 310-208-3529 if you would want a nib swapped.