I really can't say for sure. The guy I purchased it from was selling his other, unopened bottle, because he was tired of it after using-up the first one! He was ,I reckon, actually using it as it's advertised (smile). He said he traveled to London for business couple times a year ,and he had bought them, around 2006-7 as well. It is as pristine/fresh as one could hope for!
Best,
Fitch