Helmet "Tolga" with Kayı Tamgha, 15th century
Steel Turkish Helmet “Tolga” Turkish Helmet “Tolga” made of steel, iron, silver and copper alloy, stamped with the Kayı boyu Tamgha and decorated in silver with inscriptions which include the phrases "Glory to our Lord, the greatest Sultan, the noble, the mighty Khagan, master of the necks (of nations)" . Late 15th century, Height: 30, 5 cm. Weight: 1401 g. A tamgha (stamp, seal) is an abstract seal used by Turks as the emblem of a particular tribe. The KAYI tribe (Turkish: Kayı boyu) is a sub-branch of the BOZOK Tribal federation of OGHUZ Turks. Osman I, founder of Ottoman Dynasty was a hereditary leader in the Kayı tribe. Royal arsenal of the Ottoman Dynasty used Kayı Tamgha as it’s distinctive mark on every kind of weaponry. Çelik Türk Miğferi "Tolga" Çelik, demir, gümüş ve bakır alaşımından yapılmış, Kayı boyu damgalı ve “Görkem, Beyimiz, En büyük Sultan, Asil, Güçlü Hakan, boyunların (Ulusların) efendisine” ifadelerini içeren gümü