From Star Trek: Theurgy Wiki
The Antares Shipyards, also known as the Antares Fleet Yards was a Federation shipyard located in the Bajor sector. During the 2360’s and 2370’s the Antares shipyards constructed both the components and entire vessels for Starfleet.
The Defiant-class prototype USS Defiant was launched from the Antares yards in 2370, on stardate 47538.5. (DS9: "The Search, Part I" dedication plaque)
The USS Harbinger was launched from the Antares Fleet Yards on February 12th, 2371.