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): 146.0 mm/5.74″
Length (uncapped): 123.7 mm/4.87″
Length (posted): 172.2 mm/6.77″
Diameter (barrel): 12.2 – 14.0 mm/0.48″ – 0.55″
Diameter (section): 11.6 – 14.8 mm/0.44″ – 0.46″
Weight (all): 50 g
Weight (cap): 25 g
Weight (body): 25 g