FB06 Phil Wilson Fillet
The FB06 was a custom design collaboration with Phil Wilson that hasn't been produced. The design has been discussed on the Spyderco forums in 2003, where Sal Glesser mentioned  that the design was in development. However, in a different forum discussion in 2014, he states that the project was abandoned due to a variety of reasons. the design hasn't been made in production and it is not sure if it ever will see production.
Appearance in catalogs
History, mentionings from the forums etc.
- Is it time for a Spyderco fillet knife?, posted by forum member avocadobbq
- Phil Wilson filet knives?, posted by forum member LBNoble.
Information from the Spyderco catalog on the web
Most collectible variation
An original prototype would be the only existing and therefore most collectible variation of the FB06 Phil Wilson Fillet knife.
Questions regarding collecting the FB06
Some interesting questions we are looking for an answer to: Does anyone know what happened to the development of these designs?
Questions with an answer:
Measurements (mm and grams) of the FB06 Phil Wilson Philson Fillet:
Online reports indicate the (prototype) design had a 152mm blade. No other measurements are known.
Measurements (inches and ounces) of the FB06 Phil Wilson Philson Fillet:
Online reports indicate the (prototype) design had a 6 inch blade. No other measurements are known.
A picture that reportedly shows the prototypes of both the FB06 and FB07 Phil Wilson Fillet knives can be seen in this Spyderco Forum discussion thread.