Pictures say it best.
I read the other thread about keeping a uke hanging on the wall for ease of access, and people were talking about hanging up some nice ukes like it was a good idea. One was a Kamaka and I could just see it a few years down the road.
Just in my observations of ukes for sale over the last couple of years, Kamakas especially seem vulnerable to separations along the book matched seam top and back, and often the edges lift at the sides. Also they crack vertically from the bottom edge along the heel block.
I have two Kamakas. When I bought the white label concert the owner disclosed that it had had a very slight separation on the top along the seam from the soundhole to the bridge, so he humidified it for a few weeks and it closed back up. It has been fine since. I left the vintage pineapple with a generally respected luthier (who I later discovered is extremely dismissive of vintage ukes especially) to reglue the bridge, and it came back with a bottom separation and the bruises it had had turned into cracks, because he had it in the San Fernando Valley and it was not humidified. He had actually set it aside and forgot about it on several occasions, so it just sat in it's case cooking and drying out.