- The Star Fleet Technical Manual had the registry as NCC-1705.
Excalibur 's commanding officer, ca. 2252, was Captain Dmitri Vlasidovich, who was of the same Starfleet Academy class as Christopher Pike and Hood 's then-CO, Michaela Harrari. (TOS novel: The Children of Kings)
- Some sources list Captain Harris' first name as Thomas, others as Timothy. In Star Trek: Excalibur, it is Anton.
In 2268, Excalibur was severely damaged during exercises with the USS Enterprise. The Enterprise, under the control of the malfunctioning M-5 computer, fired its phasers at full power easily penetrating the minimally power shields of the Excalibur, killing the entire crew. (TOS: "The Ultimate Computer")
In 2272, the Excalibur, along with much of the Constitution fleet was refitted. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era)
During the Kelvan War in 2285, Excalibur, under Captain Croft, was assigned to Task Force Four and was one of the few survivors of the engagement against the Kelvans. Her personnel were rescued by ships from Task Force Six. (Orion Press: In Harm's Way)
- Rear Admiral Young is said to have commanded Excalibur since 2280, which conflicts with the Orion Press accounts. (Starfleet Communiqué 20)
The Excalibur was finally decommissioned in 2297. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era)
Following the M-5 incident the Excalibur was salvaged. During its repairs it was partially refitted and served as a test bed for several of the upgrades that would be later applied to refit the Constitution class. After 18 months in drydock the Excalibur was relaunched under the command of Captain Thomas Nelson. (Star Trek: Excalibur)
- The registry for this Excalibur is NCC-1705.