Two votes for a dip nib pen (decorative). Probably like Grubstake said made to fit into a diary or compendium.
I remember them well from school. Ours were usually made cheaply of wood.
Also remember the ink wells that used to be filled with cheap school ink out of a bottle with a special rubber ink well filler cap. The ink was an uninspiring dark grey colour and some of us bought their own ink bottle out of pocket money. QUINK ink was a favourite for its lovely blue colour.
Other suggestion could be an instrument of torture out of a doctors or dentists bag.