Kind thanks to Joost from Appelboom Pennen, who lent me this pen.  If you shop at Appelboom, use the discount code in the banner below (‘friend’) for 10% off your purchase – excluding Montblanc.

Measurements
Length (capped): 144.7 mm/5.70″
Length (uncapped): 125.2 mm/4.93″
Length (posted): N/A
Diameter (section): 7.8 – 9.1 mm/0.31″ – 0.36″
Diameter (barrel): 9.4 – 13.1 mm/0.37″ – 0.51″
Weight (all): 38 g
Weight (cap): 21 g
Weight (body): 17 g