I recently purchased a clockwork AM Flyer Hiawatha Streamliner and just realized that the beavertail is painted differently than most versions.  Mine has a solid gray beavertail with no lettering, while most have orange stripes and Hiawatha lettering.  Is this an early or different version or just one that's been repainted?  The gray paint on the beavertail is approximately the same shade and age as the gray on the rest of the coaches.