Lot 37004. Annam, Thiêu Tri silver 7 Tiên ND (1841-47). Estimate: $3,500 - $4,500. Photo Heritage Auctions.

AU55 NGC, KM288, Sch-238. Housed in an NGC jumbo holder. Obv. Thiêu Tri Thong Bao. Rev. Two dragons, facing, around center hole. Superbly struck, for the issue, with moderate gray patina and a few light marks. An exceptional example of this very scarce issue. 

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