I just purchased some old red and green G scale passenger cars in wonderful shape.  They have snow on the windows and North Pole & Southern on the side.  The cars do not have the compartment for a battery to light the car and have the hook & loop couplers.  It is my belief they must be old as they do not have lights.  Does anyone know when they were made?.  Is there a database one can look these things up in?

Thanks...