Excellent news! Yes, it's lugged steel. I figured as much, but wasn't sure. I know that some older bikes have weird issues with such things as the bottom bracket, etc., so I just wanted to make sure. I'm perfectly happy with the 600 group but it's starting to get pretty beat. I'd estimate it has almost 100k miles on it (it IS almost as old as I am...), but hey, it was a free bike. I think I'm going to switch to campy chorus for the group, as I've had excellent luck with those particular components in the past, and I beat the **** out of them (winter riding, cobblestones, commuting, the occasional trail/wooded shortcut, etc.) without disappointment. You can't beat these older lugged frames for ride stiffness and quality!