These nice piston-fillers, made by OMAS ex-employees, are exclusive to Write Here Shrewsbury. Limited to 50 pens, don’t wait too long with ordering if you want one. Note that the pen costs 375 GBP without VAT, which, with current exchange rates, yields a lower cost in USD than I provided in the video.

Measurements
Length (capped): 143.9 mm/5.66″
Length (uncapped): 132.0 mm/5.19″
Length (posted): N/A
Diameter (barrel): 13.5 – 15.1 mm/0.53″ – 0.59″
Diameter (section): 11.1 – 12.5 mm/0.43″ – 0.49″
Weight (all): 34 g
Weight (cap): 16 g
Weight (body): 18 g