One or two in Russia (I don't know if it's the same timepiece or not available at two different sellers) on Chrono24. It (they) is has been for sale for several months already
I did see one a few years ago at a VC dinner in honour of the Paris Opera Ballet at Lincoln Centre. It was ownd by the cousin or brother of the person who owned the Moscow Boutique. Unfortunately, the lighting was very poor and my photo was quite poor. It's a stunning piece. I believe it uses the same movement as the Tribute to the Great Explorers watch. Cheers, Joseph