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): 149.9 mm/5.51″
Length (uncapped): 126.1 mm/5.96″
Length (posted): N/A
Diameter (section): 10.6 – 11.7 mm/0.42″ – 0.46″
Diameter (barrel): 10.8 – 14.0 mm/0.43″ – .55”
Weight (all): 29 g
Weight (cap): 21 g
Weight (body): 8 g