There is no distinction between "real" and "fake" with the DC 775 motor; there are many different versions depending on the intended use, and there are multiple manufacturers producing it. I find that it can only be assessed as "high quality" or "low quality".
Brother it's video is fake all motor is in working condition so it's good motor all are good Don't watch this type of video Ok In which motor wind with copper whose good Aluminum winded motor is not good
Biggest difference is the thickness diameter of the wire. The thicker the copper wire the powerful the motor tongue hence need to install bearing to withstand motor fast spining