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Franklin-Christoph Model 31 Black Pen Society fountain pen, engraved, cap off, displayed on a dark background.
Franklin-Christoph Model 31 Black Pen Society Fountain Pen with engraved details on a dark surface, cap beside it.
Franklin-Christoph Model 31 Black Pen Society: a Delrin fountain pen with subtle embossing on a black body.
Franklin-Christoph Model 31 Black Pen Society fountain pen with engraved design rests on a dark, textured surface.
Franklin-Christoph Model 31 Black Pen Society fountain pen diagonally displayed on a dark background.
Two Franklin-Christoph Model 31 Black Pen Society fountain pens lie parallel, one with a sleek metal clip.

Model 31 Black Pen Society Fountain Pen

Market Price
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Sale price
$160.00
Shipping calculated at checkout.
Quantity must be 1 or more

We are proud to have been selected to produce the 2026 Black Pen Society fountain pen edition this year. The annual meeting of the BPS is always Saturday evening at the DC Pen Show. The club is loosely held, and mastered by the Grand Poobah aka Paul Erano. Our Scott Franklin is a high ranking member, and they have had lots of fun over the years.

For this edition we selected both the Model 31 and the Model 40M. We used Delrin for the material - a very hard yet light weight substance, and left in the matte finish. On it we have engraved various Ravens - the mascot of the Black Pen Society. Here is featured the Model 31 version, which has a clip, a traditional cap to barrel ratio, a 1/4" recessed nib. The additional engraving has "Black Pen Society" engraved around the base of the cap, and "BPS 2026 * USA 250" engraved around the end of the barrel. 

The produced edition in both models sold out at the DC show, but we will be offering here, and the San Fran Pen Show in late August. If it currently shows as sold out, you can sign up for the back in stock notice to be notified when pieces are available. 

The Model 31 fountain pen encompasses features from several F-C models. The grip section is like that of the 40 Panther, the silhouette is a slightly slimmer version of the 19, precision posting like the 20, 45, and 03, cut grooves and recessed nib like the 20. 

 Dimensions:
.625" cap diameter (15.87mm)
.531" upper barrel diameter (13.49mm)
5.50" capped length (139mm)
6.755" cap posted length including nib (172mm)
5.250" barrel length including nib (133mm)
.41-.47" thick grip section at thinnest and thickest point (10.4 - 11.92mm)

Weight without ink = .92oz / 26.08g

 Made in USA of long lasting, durable hard acrylic that is light weight. 

 Standard Int'l Cartridge / Converter filled, one of each included. Also can be used as an eyedropper. Barrel holds approximately 3.5ml of ink when eyedroppered.

 #6 Size nib - with many tip options in factory or custom ground. 

 Lifetime Warranty. 

  Shipped with a Franklin-Christoph single pen zippered pouch with an outer white thin box.