Russia 2905-2911 imperf sheets/25

Russia 2905-2911 imperf sheets of 25 or blocks of 25, MNH. Michel 2914B-2920B. Moscow Zoo 100th Ann. 1964. Elephant, Giant panda, Polar bear, European elk, Pelican, Tiger, Lammergeier. Note, the stamps 1 & 2 kop was issued in sheets of 50, all other in sheets of 25, same as image 2 for one.