The toy shown here is a Generation One Transformers Classics Octane Prototype figure purchased directly from the former head of Hasbro UK's boy toy division. The figure is an FEP (Final Engineering Pilot) of the Generation One Classics (Gold box) Octane.

FEP is a name for a group of very final development phases, within the engineering world. Often this phase is subdivided into three distinct categories:
1. FEP stage 1 : FINAL ENGINEERING PILOT - This phrase is normally involves testing of fully developed and engineered item. It comes after the EP (Engineering Pilot) but can still contain inperfections and mold differences. The inperfections are removed before the 2nd stage begins.
2. FEP stage 2 : FINAL EVALUATION PILOT - This is the pre-production testing and evaluating final engineering. Some minor modifications can still be made at this stage before the third stage is processed.
3. FEP stage 3 : FINAL EVALUATION PRODUCTION - This is the stage that tests the final pre-production sample. Checks are made for build quality and quality control. When this phase is completed, the item is deemed ready for regular production,

This figure is either a stage 1 or a stage 2 FEP.

For those wondering where FEP falls into the general production cycle compares to other testshots and prototype that you often find around, here is a very rough guide to the production process.

1. Resin / Wood / clay sculpts - Most commonly called hardcopies. These are often pinned together.
2. EP, Engineering Pilot AKA 1st Shot. These are very early, and mostly unpainted, plastic engineering samples. They have no date stamps and are quite often have molding differences. The figures tend to be screwed together but are extremely loose. A lot of the figures have a handwritten EP on them.
3. FEP (Final Engineering Pilot) - See the three stages above 4. Productions Shots. These are the most common plastic testshots that you may see for sale. They are often produced in the final colour schemes, have the date / copyright stamps and are production, or virtually production quality.