A silver Tanka, Herat mint, dated 820AH/1417AD, 5.1g, 22mm. A silver Tanka, Kirman mint, dated 825AH/1422AD, 5.2g, 25mm. A silver Tanka, Kirman mint, dated 828AH/1425AD, 5.0g, 22mm. A silver Tanka, Kashan mint, not dated, 5.1g, 22mm A silver Tanka, Kashan mint, not dated, 5.0g, 21mm.