20 years Irreproachable Service in the Armed Forces of the USSR 1st Class

The medal "For Impeccable Service" First class (Медаль «За безупречную службу» первой степени; Medal «Za bezuprechnuju sluzhbu» pervoj stepeni) was instituted on 25 January 1958 and was awarded for 20 years of service. It is the most common of the three (2nd class for 15 years was less common and the 3rd class for 10 years the most rare as in the first 10 years few individuals were "impeccable" or "faultless" while after twenty years and closer to pension the system was more "tolerant" of them). Irreproachable service medals were issued by the Soviet Armed Forces (most common), but also by the Ministry of interior (also at the republican level), for several years also by the Ministry of public order (MOOP) and by the KGB. All were distinguishable by the text on the reverse side, except the KGB issue that are unattributed.

Aluminium suspension, undocumented but in very nice condition. The 20 years medal is variation 1 made of silver and is rated R2 (variation 2 issued later was made of a silver like alloy), the 15 years is R1 and the 10 years has a C rating.

Ribbon:

A	Abundant, readily available, often in wholesale quantities.
C	Common, always available. Occasionally in quantity.
R1	Usually available without a long delay. Difficult to find in quantity.
R2	Scarce to rare, less seldom available.
R3	Rare. Difficult to find.
R4	Very rare. Demand outstrips supply, and specimens, when available are often eagerly sought.
R5	Extremely rare and seldom available. Collector may have to search for a few years to locate one.
R6	Of the highest rarity. Very difficult to obtain.
R7	Almost never available. Most collectors will not have a chance to acquire these pieces.
R8	Never been on the market. Almost impossible to obtain.
R*	Not available for collections.