idk, the way I research for dates is look for reviews on google, and check which one is dated the oldest, and for the ATC-201 the oldest review I found was from january 2001. BTW I've found revision 2 of the case which came out later, too.. Oh, and I'm currently following an auction for ATC-200, that I wanna take for the dream 2000 pc project. Ideally I also want ATC-100 for dream 1999 pc project, but I've never seen ATC-100 for sale, ever, its probably unobtanium. Talking of unobtanium, I decided on which would be the ultimate 2001 motherboard - Tyan Tiger MP (S2460) - amd 760MP chipset, dual socket A 😀 Obtaining it for a reasonable price will be hard, so I'll build the system with the tusl2-c or kt7a-raid for now to get it going, and upgrade it to the Tiger when (if) I ever obtain one