Russia 1997 (2004) trio of 100 Rubles. All 3 experimental Series: UU, FF, TSTS. Those 3 experimental series were issued by Russian Goznak printing factory around 2006 to test durability of differently made banknotes (different paper and/or different protective lacquering). All 3 notes are graded as GEM Uncirculated PMG-67EPQ with Exceptional Paper Quality.