The Good Blue Co. is a small maker from the United Kingdom that is known for unique and distinctive designs in Europe, along with standard nib sizes they offer great flex nibs that come in Standard Steel or Titanium.

The R615 was designed to produce beautiful flex lines. Precision engineered to be your pen of choice.

The design is organic and natural which the simple flowing lines, made to be as simple as possible (but no simpler). The overall form is described by a single elliptical curve and a flat plane. Beauty through mathematics. The flat sections line up to make a roll stop across three components: A Swiss watchmakers’ technique.

The feed design is fine tuned polymer which will keep your ink flowing for all your flex needs.

You have your choice of flex nib material, either Stainless Steel or Titanium

SS Fine Flex Polymer Feed - Our Fine Flex nib with a specially designed polymer feed for wetter writing and juicy swells
Titanium Flex Polymer Feed - A soft, monster of a flex nib. Our wettest option puts down a ton of ink
Standard nibs are steel in gold tones from Medium to Zoom

The center of mass of the pen sits in the brass grip section to allow a neutral balance and better control of writing pressure for flex.

Length	150mm (5.91in)
Length Uncapped	138mm (5.433in)
Diameter	16mm (.629in)
Section Diameter	10.5mm (.413in)
Pinch Point	10.25mm (.404in)
Weight	45.23 gsm
Materials	6082 aluminum, anodized and CZ121 Brass untreated
Nib	Steel or Titanium Flex ( Compatible with most JOWO #6's depending on the curvatures
Cartridge / Converter	1x Internation standard Schmidt K5 converter