It's a rather unusual quote. I have heard similar phrases, such as:
Have passport, will travel.
Have suitcase, will travel.
In both examples, it means "I have a .... and am willing to travel". Obviously, both a passport and a suitcase would be quite helpful when travelling!
I can only assume that the speaker of your phrase is perhaps a travel writer, so it would be very useful for him to have a pen (quill pens being the old pens made of a feather dipped in ink to write). It's my best guess.
If you could give us more context, that would be good.
There used to be a television program called, "Have Gun, Will Travel". The hero of the program was very good with shooting a pistol. He would travel throughout the American west (19th Century) and get rid of criminals. He was usually hired by local towns which had bad people living in them...
Your source pre-dates mine by a good few years. I heard (on a BBC radio program about language, which I believed at the time) that the expression 'Have X, will travel' was a standard format in a US publication that gave details of jobbing entertainers: 'Have tux. will travel'.