Set of 5 1961/1991 Soviet Russian Notes - 1, 3, 5, 10, and 50 Rubles. After being formed in 1990, but before issuing its own Rubles in 1994, the internationally unrecognized state of Transnistria (Pridnestrovian Moldavian Republic) continued to use Soviet Rubles. As the Soviet Ruble was replaced in all other ex-Soviet states by local currency, Transnistria was flooded with currency. To avoid a hyperinflation event and financial catastrophe, the Transnistrian government bought used Goznak-printed Soviet and Russian notes dated 1961–1992 and modified these notes by applying adhesive stamps bearing the image of General Alexander Vasilyevich Suvorov, founder of Tiraspol, and the notes' corresponding denomination. Currently, Transnistria is a polity with no credible international recognition and its territory is formally part of Moldova, so its currency has no ISO 4217 code, and thus Transnistria cannot participate in any card payment processing network. Transnistria is often considered "the last bastion of the Soviet Union". The "Sixth Soviet Ruble" was issued first in 1961, and the designs for both the non-commemorative coins and paper currency of the Soviet Union almost remained identical from 1961 nearly until the fall of the Soviet Union in 1991. Briefly before the Soviet Union fell, there was the monetary reform of 1991 and the release of the Seventh Soviet Ruble, with designs that were fairly similar to the 1961 Rubles. Interestingly, the 500 Ruble note only existed for 2 days before the collapse of the Soviet Union, and the 1000 Soviet Ruble note only came into existence 3 months after the collapse of the Soviet Union. Some Soviet banknotes were printed and remained in use in various ex-Soviet states in 1992-1993, still utilizing the 1991 Soviet designs.