This Optimus Prime varation seems to be only found in northern Europe. It was only produced for a short time, before it was switched to the common blue color. The feet are actually painted the same color red as the rest of the cab. Also in comparison to the other "Regular" produced Optimus Prime's, you can see the one from northern Europe has a lighter color red body in the plastic and the paint.
Another slight varation is the silver pattern on the top of Optimus's head. The Optimus from northern Europe has this pattern painted silver only on the rims. The "Regular" Optimus Prime has the entire pattern painted silver. It is unknown now if the trailor or any other parts and pieces were different than the "Regular" world wide release. It is speculated that this "Red Feet" Optimus Prime can only be found in early Milton Bradley packaging.
Collection of: Alex Bickmore
Paragraph: Alex Bickmore
Photos: Alex Bickmore