My Lisa 1 has the short-persistence "paper white" phosphor seen on the left, while my Lisa 2/10 has the long-persistence phosphor on the right. I've always suspected that the Lisa 1's monitor is original and wondered whether the 2/10's may have been replaced at some point. It was a machine sold as a Macintosh XL by Sun Remarketing, who may have cobbled it together from parts.