Says so in the listing DR! Actually, it's hard to tell for sure, but from the photo it seems there is a glint as if the arm were epoxied, which would only be done with a rewound armature. Also, just by supposition, a chassis this sophisticated would automatically go with a rewound arm - we were all rewinding back in the day!
Looking at it closer, the can certainly looks like a Cox, but for the rest not too sure - hard to tell if that's a standard Mabuchi endbell, and the bearing on the back would be the type of motor that had the shaft coming out that end, not from the endbell, so the motor has been worked on.
Don