Early (from the 20’s) ebonite eyedropper Swan Safety Screw Cap, flat top (captop in this model was designed to be kind of a crown of the pen), not very common actually. The cap screws on the body, unlike as in other eyedroppers. Amazing wet noodle nib, stubby, with a flex up to 2mm. Very good cosmetic condition, imprint on the cap clear, on the body faint but still readable.   Slim and long, very elegant pen. 13,2 cm closed, 16,2 cm capped. $180 hipping included