Watch List notes:

COINS, 錢幣, CHINA – MACAU, 中國 - 澳門: Error 錯體 50-Avos, 1993, overstruck 重印 on Copper-nickel Nigeria 10-Kobo, 1976 (KM 10.1), instead of issued brass, the legend and design of the Nigerian host coin clearly visible on both sides (KM 22 for type); Copper-nickel Nigeria 10-Kobo 1976 and a Brass Macau 50-Avos 1993 included for comparison. Minor planchet flaws on reverse rim, otherwise about as struck, rare.
(3pcs)

Estimate: US$750-950