The USS Ambassador (NCC-10521) was the prototype of the Ambassador-class that saw service with the Federation Starfleet during the 24th century. It was launched in 2322 (Star Trek Encyclopedia; Ship Recognition Manual, Volume 1: The Ships of Starfleet)

Prior to its official launch, Ambassador underwent testbed trials at Helaspont Station near Tzenkethi space in 2319. (Star Trek: The Lost Era novel: One Constant Star)

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