Being new to the FP hobby, What resources are collectors using to determine which specific Parker 51 Vac or Aero FP have more value then others, Colors,years and such. At the moment I'm wanting to read and learn before I start to collect them. Market Values?
For instance on http://www.vacumania.com site I can see come complete sets in mint condition verse 1 Pen prices. I realize Color,condition,number of that pen made, and such all come in to play but what Book/s determine the values. BTW I love the pens on his site.