China
Qing Dynasty brass "Engraved Master" 1000 Cash ND (1854) Choice XF, Kansu mint, type of Hartill-22.812 & FD-2543, 66mm, 96g. Obv. Xian Feng yuan bao. Rev. Boo gung, left and right; Dang qian, above and below. This appears to be the "master" coin after approval from the Emperor, with the small center hole enlarged to the normal square hole. Exceedingly rare.
HID02901242017
Estimate: 10000-15000 USD