>>1394379I'll go with an obvious choice:
The Soyuz spacecraft, for instance, developed by the Korolev Design Bureau, which is only one part of the entire similarly-named rocket-system which is currently (for the past eight years and counting) the only way of reaching the ISS.
Foundationally the pair are based on an 53 year-old design, have been lauded for their reliability and cheapness. Their family of R7-rockets have completed an entire third of all launched spacecraft, with three times the more launches when compared to the holder of the second place, also of Soviet design.
Bonus: The entire production of Oscar Wilde.