Russia 4663-4664a x 2 pairs/label

Russia 4663-4664a strip of two pairs/label, MNH. Michel 4728-47-27zf x2. 1978. Photographic survey and telescopic observation of stars by crews of Soyuz 26, 27, 28. Y.V Romanenco, G.M.Grechko. Actual strip can be folded along perforation.