Interesting question as most Paradigms have been released in limited numbers usually 100 but you can't forget the Paradigm Javelin (perhaps 5 or 10) which was the prototype to the Paradigm Diamondback.
Also rare are those Carbon Shave Damascus steel razors which seem to be 1 or 2 offs ? I am not sure of the exact name or details.
For me my "rarest" razor which is neither modern nor actually rare is my most unique never to leave my den razor. My father's original condition Gillette FatBoy. It may not fit Frank's definition of modern rare but it does for me.
Also rare are those Carbon Shave Damascus steel razors which seem to be 1 or 2 offs ? I am not sure of the exact name or details.
For me my "rarest" razor which is neither modern nor actually rare is my most unique never to leave my den razor. My father's original condition Gillette FatBoy. It may not fit Frank's definition of modern rare but it does for me.