Help Identifying Vintage Pilot Fpn

[josleah]

I got into the pen habit a few years ago, buying my first one off of eBay for around $15. I'd really like to know more about it, although I've hit a lot of dead ends in my searches. I'll include some pictures, hopefully someone else knows a little more than I.

 

What I know about it:

It's Pilot, with a fine 14k gold nib. It's possibly from the mid 60's though I'm not sure. I can't locate a manufacturing date on either the tail or nib. Also, it looks like it takes a Con-W converter.

 

Thank you!