Vietnam (Annam), Khai Dinh (1916-1925), medallic silver 7 tien, undated, legend Khai Dinh Bao Chien surrounding flaming sun, rev. stylised dragon, plain edge, wt. 28.29gms. (KM.X.M1.1; Dav.143), some light scratches in obverse and reverse fields, otherwise extremely fine, rare (£700-800)