Majestic - Large - D Squared Guinea Bissau - piston - Bock 380 #8 nib

Closed 5 11/16", 144.46 mm
Open 5 1/4", 133.3 mm
Posted 6 3/4", 171.45 mm

Barrel thread diameter .600", 15.24mm
Cap and barrel diameters at thickest points .700", 17.78 mm