Review (4/5): Works good, not great!
This replacement head appears to be original, but it could be a great knockoff. It did not arrive in retail packaging but a sealed plastic bag in a cardboard box. While shaving, it isn't as close of a shave as I remember the original one being. It seems to take longer than usual to get a clean shave. Either Phillips Norelco is making an inferior cheaper product now, or this is just a inferior copy of the original. For the price I would probably still purchase it though.