Yes, and I'll admit I haven't read it, and don't know his sources. But
is an ambiguous sentence. Adopted when, for what pens, and in what way? Is the part of gweimer1's post regarding colors extrapolative musing, or based on solid knowledge of Esterbrook's production processes?
I'm skeptical, but also curious, and certainly willing to accept that J barrels and caps were injection molded if that's where the best current information lies.
"Using the newly developed injection molding process for making plastic products (Esterbrook being one of the first), the firm brought the cost of making colored barrels and caps down to a point where $1.00 pens could be offered in colors other than black. This occured (sic) sometime around 1938." Hoban, Paul, The Fountain Pens of Esterbrook (BDH Productions, San Dimas, California, USA. 1992) page 5.
" . . . the injection molding process, now mastered, was cheaper than the old way of handling plastic, enabling the company to offer five bright colors (and black) for a dollar; while a higher price had to be charged for the pens in the more exotic colors, which were still made the old way. In addition to the known advertised colors, five others have been found in pens which were produced during this period: a solid white, solid green, solid bronze, a white-on-white find grained pearl, and a yellow fine grained pearl. The model designations for fountain pens of this period (as well as the entire line of Esterbrook writing products) are shown in the (ca.) 1938-1939 catalog reproduction appearing later in this book." Hoban, Paul, The Fountain Pens of Esterbrook (BDH Productions, San Dimas, California, USA. 1992) page 12.
"The fancy colors (Morocco Red, Foliage Green and Pearl Gray) were also dropped from the line during the war years." Hoban, Paul, The Fountain Pens of Esterbrook (BDH Productions, San Dimas, California, USA. 1992) page 13.
The pens "in more exotic colors" referred to in the second and third quotes were known by the name "Dollar Pens" and had clips that had one large hole or two small holes in them and without "Esterbrook" on the clips. These predate the J which had a solid clip with three vertical lines in it and, in 1948-49 onward had "Esterbrook" stamped on them.
As gweimer1 stated the Esterbrook J's were injection molded. The Esterbrook J did not come in any of those "more exotic colors". The colors and patterns of the Esterbrook J the product of their injection molding process despite that some may "find it hard to believe" or feel "skeptical".
Tweel, I hope I have given you sufficient sources and adequate documentation. If not, you should feel free to research the subject yourself. You might start by doing a search on the Fountain Pen Network.
So Estie Js were injection molded/extruded?? If so, then I am unimpressed by the fact that companies today can't make an injection molded pen like a second tier company did in the late 40s to 60s....
I don't blame you. Why haven't companies today made such a quality pen? Also, if you read Hogan's excellent book, you will learn about a twist fill fountain pen Esterbrook made for two years during the war that, at the time of his writing the book (1992) showed "no sign of deterioration after 48 years. In fact, it fills and works fine." Don't you know I would love to have one of those!