Good idea ! I think this should be a group effort because as we all know houses rather conceal than publish reformulations and when they dsicontinue production, and reissue a similar perfume later. A new forum or group for brands' histories, vintage and discontinued perfumes would be needed for constant easy access and expansion. Basenotes would be ideal because Grant's directory has been designed to include all perfumes of all brands, no matter whether or not they are still being sold. Fortunately, the Basenotes directory also tries to show original release dates as exactly as possible.