This pen was kindly sent to me by Ian of Schon DGSN – thank you!

Measurements
Length (capped): 90.3 mm/3.55”
Length (uncapped): 86.6 mm/3.41”
Length (posted): 132.4 mm/5.21”
Diameter (section): 9.9 mm/0.39” (ribbed, uniform)
Diameter (barrel): 12.6 mm/0.50”
Weight (all): 18.5 g
Weight (cap): 14.0 g
Weight (body): 4.5 g