Rare Blow Filler Chilton Fountain pen.   The gold nib is marked Chilton Pen , Boston .  Blow filler retracting section with insert as seen in picture.  The hard rubber appears to be chased in a lizard or alligator skin stamping three gold bands on top of cap and ring top. .  The pen measures 4 5/16 inches (110mm) long when closed not counting the ring top. So hard to find these early chilton pens and the blow filler is the hardest. I have rarely come across them during my pen collecting.  Not restored. very clean though.