This is an original Ottoman coin, 20 silver piasters from the era of Sultan Abdulaziz (1861-1876 AD). • Metal: 830 silver (meaning it's real silver, not plated) • Approximate weight: 23-24 grams • Diameter: about 36-37 mm • Mint: "Struck in Constantinople" (Istanbul) - clearly written in the second picture • Written date: 1277 AH (year of accession), and also written on it "Year 7" which is the year of reign, meaning it was actually struck around 1866-1867 AD. The obverse features the Tughra (Sultan's signature) surrounded by stars and crescents, and the reverse features the value, date, and mint - this is a standard known design for Abdulaziz's coins. Whoever knows its value is welcome to message privately, and the sale is negotiable.