MS61 NGC, KM428, Sch-350.1, simple (normal) dragon, 9.4g, 35mm. Obv. Inscription, Tu Duc Thong Bao Trieu Dan Lei Chi around central hole. Rev. Simple dragon around central hole. A superb Mint State example, with argent-gray patina and considerable remaining luster.  

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