I came across this packaged new old stock Mura Power-Pak 16D armature with brushes and brush springs:
Sure looks like it could be a true rewound Mabuchi armature and comm:
The clockwise timing is clearly marked:
A CW timed Mura. That blows the old adage, "Mura's are always CCW timed."
Just goes to show when it comes to vintage slot cars don't say "NEVER" or "ALWAYS".