fountain pen
Standard word for a fountain pen. The reading まんねんひつ is the most common; まんねんぴつ is a variant, and まんねんふで is rare.
I received a fountain pen from my father.
I fill the fountain pen with ink.
He likes writing letters with a fountain pen.
My fountain pen ran out of ink in the middle of the meeting.
I was given a fountain pen by my teacher as a graduation gift.