Soviet Irreproachable service in the Armed Forces 20, 15, 10 year awards

Established in 1957 and issued until 1991 awarded to the Soviet Army and Navy, the MVD and KGB awarded these medals separately and the reverse of these medals are different. The reverse of these awards read for 10, 15, 20 years irreproachable service in 4 lines from the 8 o'clock to 4 o'clock position reads Armed forces and the Cyrillic letters for USSR at the bottom, the 20 year service medal is a Variation 1 made of silver with a nice patina