Hello, all -- thanks in part to the helpful guidance of this forum's members, I pulled the trigger yesterday and bought a new 1815 manual: YG, with a black strap substituted for the standard brown one. I do love it. Here are a few photos of what I hope will be my lifelong friend. A glance at the wrist shot will explain why I was so concerned about opting for a smaller Lange model!
Again, many thanks to everyone for the guidance. Here are the photos: