I found this information written in a board in the palace with the title: Selaih Khana: Arms and Armor collection of the Asaf Jahi dynasty (1724-1949 CE)
Rich in diamonds, Hyderabad was the wealthiest princely state in India. It was a place of dramatic artistic, cultural and political developments that spanned centuries, and flourished under the rule of Qutb Shahi Sultans, Mughal Emperors and Asaf Jahi Nizams.
Each ruler left behind evocative evidence of their military might. Helmets, armor, swords, archery equipment, daggers and other arms all of which are highly distinctive and often unique examples of exquisite metal work.
This exhibition highlights stunning examples of watered steel blades, hilts embellished with gold and silver inlay, masterfully crafted daggers and dagger blades, and rare examples of shields with decorated leather work.
The Selaih Khana, the armory of the Asaf Jahi dynasty not only contains metals and leather objects but it encapsulates glorious history of Hyderabad-Deccan.