This is an Alwar State One Rupee Silver Coin issued during the reign of Maharaja Mangal Singh in the name of Queen Victoria Empress struck between 1877 and 1892
• Standard Weight: 11.66 g (approx. 1 Tola)
• Silver Content: .917 Fineness (91.7% pure silver, matching the standard British Indian Rupee specification of the time).
• Actual Silver Weight (ASW): 0.344 ounces (~10.69 grams of pure silver).
• Diameter: 31.5 m