It's 1920s-30s; you are a spy in London. It is imperative that you write a cryptic message to thwart an attempt to sabotage a train pulling into London Waterloo Station at 4 minutes after midnight.

You trust your eye dropper Onoto the Pen by De La Rue to save the day.
Onoto DeLarue THE  PEN is one of the best pens of the early past century. This rare eye dropper filler is an exceptional example with excellent black diamond scoring, 14 K #3 original semi~flex nib and clean cartouche.
 
$199