This is a rare HO-scale Rivarossi Gold E428-166 electric locomotive, cat. no. 21444.  This is from the Modello ORO Series circa 1965.  It is plastic with gold finish.  The loco looks very complete with nothing broken.  There are some very minor scratches on the shell.  Tested on DC and it ran fine.  There are 2 headlights on each end but we see only one light came up so the other bulbs inside may need replacement.  There is a lever switch on the side that can turn the motor on and off.  Please take a close look at the photos for more info.

Thanks for looking.