1906, Kingdom of Montenegro, Nikola I. Nickel 20 Para Coin. Mint year: 1906 Reference: KM-4. Denominations: 20 Para Diameter: 21mm Material: Nickel Weight: 3.99gm Nikola I Mirkov Petrovic-Njegoš (October 7 [O.S. September 25] 1841 – March 1, 1921) was the only king of Montenegro, reigning as king from 1910 to 1918 and as prince from 1860 to 1910. He was also a poet, notably penning ...