The New Improved razor from the 1920's is more aggressive than the NEW from the 1930's. The NI will bite you if you're not careful. Both are excellent, however.
Here’s another Ad, with a little more detail about the “New” blade.The NEW was designed to be used with different blades, the New Gillette Blade
This.The New Improved razor from the 1920's is more aggressive than the NEW from the 1930's. The NI will bite you if you're not careful. Both are excellent, however.