I'd guess about 1995-6. I got my first vaporizer, a Flash Evaporator, in 1994 (I recall because I had just moved). The Eterra came maybe 1-2 years later.
The Eterra Web page says, "Flashevap stopped producing the Eterra in 1999" (at http://www.flashevap.com/eterra.htm). {Maybe, some data to add to the Vaporpedia?]
