This TroubleShooter is made from Conway Stewart Amethyst Fleck vintage resin. It is shown fitted with a JoWo No6 medium gold plate nib with a matching yellow metal accent ring at the grip.
The 1313 is a medium sized pen with no step between the 13mm cap threads and the remainder of the barrel. The grip section is slightly pinched to ≈12mm diameter at its narrowest point. As these pens are all hand made there may be small variations on measurements.
Length - Capped = 138mm, uncapped = 131mm
It can be filled with an international standard sized converter or cartridge, and one of each is provided with the pen.