This pen was kindly sent to me by its maker, John Hubbard – thank you.  Get yours here.

Measurements
Length (capped): 139.4 mm/5.49”
Length (uncapped): 132.4 mm/5.21”
Length (posted): 156.7 mm/6.17”
Diameter (section): 12.5—12.9 mm/0.49—0.51”
Diameter (barrel): 10.4—14.0 mm/0.41—0.55”
Weight (all): 21.0 g
Weight (body): 16.0 g
Weight (cap): 5.0 g