According to the Los Angeles Times article, in Japan, a set of the above handmade cases is being offered for the phone. Each case is covered in a special lacquer and gold dust. The most likely warlord to have carried one of these would have been Toyotomi Hideyoshi and probably the least likely would have been Uesugi Kenshin and his heir Uesugi Kagekatsu. Hideyoshi was very fond of things gold, he even had a gold tea room.
The five designs were inspired by the Sengoku period which ran from the 15th to the 17th centuries. In one of the cases you can see a faint outline of a warrior in black. Each case takes about a month to produce and comes with a booklet describing its historical context.
The cases are offered by SoftBank BB and they cost about $1,000 each.
The original article comes from the tech site CrunchGear.