Might not be useful but to help you tell the differences between Olds and News, especially as they can appear similar. The baseplate on a New doesn't have holes in, whereas the Old Type had a hole either side for metal cones (no doubt there's a better word but for now it's cones) that protrude through. The Old Types (some or all?) come with a piece at the end of the razor handle which slots through the hanlde and into the head. The News all (as far as I know) have three pieces which just screw together without fitting inside eachother etc.
Check out also www.mr-razor.com. There are New Improveds, which preceded the News, which I don't know much about. Hunnymonster rated them in the 'desert island razor' thread a while back.