MS63 NGC, KM442, Sch-407A, large characters. Obv. Inscription, Tu Duc Thong Bao around central hole. Rev. Inscription, Tam Tho, and the three Longevities around central hole. A Choice Mint State example. Well struck, with remaining luster. Very scarce in this exceptional condition.  

Heritage Auctions. 2016 December 8 - 9 HKINF World Coins & Ancient Coins Signature Auction - Hong Kong #3050