More pics here.
It's a Miyata Alumicross, which was their top of the line "cross" bike. It wasn't exactly sold as a cyclocross bike but that's what I plan on using it for, because it basically is. At some point I imagine I'll replace the drivetrain, but I just finished rebuilding it so that can wait. It was a NOS floor model from the 90's I got on Ebay. Aluminum bonded to steel lugs and steel stays. Pretty cool.