Welcome to the forum Barr44
To start with your grips, for me they look original to me, but that's hard to tell without a picture of the inside. Also, the Luger would have to be in right period to have such bakelite grips. So if you can snap a picture of the inside of the grips + reveal the #, we can try to find out if the grips are 'right' for your gun.
The sideplate and takedown lever should have had the last two digits of the serial # on them (and TDL not strawed). So those have been replaced.. Are you sure the receiver is not marked e/655 ?