Around 1000 made. It's not been made public how many of those sold though at least one A1 vendor has recently stated that they intend to sell off their remaining A1 stock (no indication of how many), so obviously they didn't *all* sell.
Being used? Fewer each month as they've been dying off for years now. If you figure a conservative die-off rate of two per month, that's 24 per year, and they went on sale what - in 2003? So figure around 120+ have died.
There was a poll a couple months ago on AWN of active OS4 users in the UK. I can't recall exactly how many responded, but the results of the poll would be a good watermark because there are barely any A1 owners in the US and only a handful more in Canada. It wouldn't be a huge shock to me if there were only about 500-600 active A1 users today.
