(Black Sheaffer Balance Premier (OS) pen - Vacuum-fil - medium-fine point

People tend to call this pen an OverSize or OS. It is already quite aptly named the Premier.

I've restored it with modern materials and the vacuum is almost strong enough to use as a pogo stick.

 Length
Capped - 140 mm (5.5”)
Uncapped - 121 mm (4.8”)
Posted - 163 mm (6.4”).
Diameter
Cap - 15 mm (0.6”)
Barrel - 12.8 mm (0.5”)