Unfortunately, I don't really see any rare stuff at least in terms of the lenses. One of the major problems of Leica lenses at least made in the 80s and before (I don't know anything about the ones made in the 90s and later) is that they are easy to fog. The majority of the used Leica lenses sold in Japan are fogged to various extents. The fog is difficult or impossible to clean. The soft internal coatings are scratched easily. Many of the unusually clean sample have the elements re-ground and re-coated.
