NAR-30974 was a Federation drydock that was in service with Starfleet in the late 23rd century. In 2293, the USS Enterprise-B was launched from this drydock. (Star Trek Generations)
The registry on the model
This model was first seen in Star Trek: The Motion Picture as the spacedock the USS Enterprise was launched from. It was heavily modified and labeled with the registry of NAR-30974 for Generations.
This appears to be the same type of drydock that the USS Voyager was launched from at Utopia Planitia Fleet Yards in the episode "Relativity".