This is a Wahl Chancellor Design 12 karat yellow gold filled medium size clip fountain pen c. 1924. The Chancellor Design is repeating panels with diamond shapes on a straight line background around the cap and barrel. This 4 7/8 inch long pen is the medium size slender model with a 14 karat gold Number 2 size nib. The Chancellor Design appears in the 1924 catalog only on a 12 karat solid yellow gold midget ringtop pen and pencil. This may be an off catalog pen. The barrel has a rectangular blank in one of the panels for engraving.