British Museum's Capucine Korenberg, estimates there were around 8,000 woodblock copies of "The Great Wave" by Katsushika Hokusai from 1830s. Many of which have been lost or destroyed. Two great editions of this iconic print, technically called: "Under the Wave off Kanagawa", are coming up at Christie's & Bonhams.

A followup now that both the auctions closed. The copy hammered at Bonhams (in the pic you can appreciate the rear of the print) was sold for Sold for US$889,500 including premium. While the one offered at Christie's hammered a USD 856,800 plus fees.