Viktor Gorbatko signed Vostok 1 cover

Viktor Gorbatko signed 1991 Vostok 30th anniversary, Benham cover. 

A veteran of three Soyuz flights, Gorbatko’s first mission was Soyuz 7 in 1969. During the Soyuz 24 mission in 1977 to the Salyut 5 Space Station, Gorbatko had to vent the stations air after toxic fumes had caused the evacuation of the prior Soyuz crew. His final flight in 1980 on Soyuz 37 was a long duration mission over 79 days.