Some Sailors. Please show yours as well.

I've found you an extra 4mm: My Pro Gear Realo measures 119mm from nib tip to piston knob end. As near as damn it identical length to the Platinum #3776 when compared that way.

Quick edit to mention; mine is the older Pro Gear, the newer Pro Gear II has different components, most notably the clip - I think this may measure longer again.