A:Answer As a Norelco owner for years, I can tell you that the Series number is usually just above the on/off switch. It is also
on the back of the razor as something like S9320. So this would be a 9000 Series with 320 sub model. A head replacement
for Series 9000 will fit all sub models of that series. If the Series number has worn off, I would take the razor to Best Buy
and look at the products on the shelf. Also could go to Norelco web site where they have a review of all models available.
