The "b" bottles are not all original forulation. Some are made by Five Star. You have to read the label on the bottom of the bottle to make sure. On the circular bottle, it's the same thing. Also, I noticed that the caps on these bottles are a little different, but that's just on the inside. The older ones feel heavier too, though I didn't weigh them out to be sure.
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The same thing happened with Francesco Smalto and Ungaro. Original releases were made in one country. Subsequent releases were made in other countries and scents changed - for the worse IMO.