Well, "Havana" is the English (worldwide language) spelling of the Spanish (language spoken in Cuba) "Habana". While the island produces a superior product, quality control of various factors, consistency being one of several, isn't what it is as a result of administrative accreditations, etc., employed in other areas of the world. This makes me think that isom companies may use the two spellings interchangeably.

However, upon just now checking 6 different brands, the word is spelled with a "b" in every case. Based on this, you may have an authenticity issue with any purported to be genuine isom's, but that are spelled with a "v".

So, this is only a partial answer; I'm sure someone will log in and clarify. It's a good question - now I'm curious too.