LeBoeufs have long been among the most desirable and least available American fountain pens. The LeBoeuf Fountain Pen Company was founded in Springfield, Massachusetts in 1920, and gone by 1933, but in its thirteen years produced beautiful and innovative pens. The founder developed a process of building pens from celluloid tube, rather than sheet and rods, which probably enabled the use of celluloids that were often simply stunning. In addition, LeBoeuf developed a unique sleeve filling method that they marketed in 1931 as “Unbreakable”. LeBoeuf pens are highly desirable, and the larger sleeve fillers are among the most prized and expensive vintage pens one can find.