I asked Mica that same question when I spoke to her on the phone right after I got my Alembic. My serial # is 14148, but she said there were maybe 600 - 800 additional Alembics that had duplicate serial numbers, so the total count could be around 15,000. Still a very elite owner's group when you consider that lots of people own more than one Alembic, so the total number of owners is much smaller than the total number of Alembics.