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): 142.9 mm/5.63″
Length (uncapped): 136.7 mm/5.38″
Length (posted): 162.5/6.40”
Diameter (section): 9.9 – 13.1 mm/0.39″ – 0.52″
Diameter (barrel): 11.2 – 12.9 mm/0.44″ – 0.51″
Weight (all): 35 g
Weight (cap): 23 g
Weight (body): 12 g