In the article, Jein had made an attempt to 'logically' couple the registry numbers as seen in 'Court Martial' with the names listed in the reference book The Making of Star Trek. The registry was first connected with the starship in Greg Jein's influential ' The Case of Jonathan Doe Starship' article, published in the April 1973 issue 27 of the T-Negative fanzine.

The registry of the Excalibur was not confirmed until it was seen on the CGI model in the 2008 remastered version of 'The Ultimate Computer'. In the original version of the episode, a transposed image of the USS Constellation from ' The Doomsday Machine' was used to represent the Excalibur after the ship's destruction by M-5. The episode itself provided no firm confirmation either way. The fourth edition of the Star Trek Encyclopedia offerd two possible conditions of the Excalibur - the ship was severly damaged (vol. While the death of its entire crew is established, the status of the Excalibur itself is somewhat unclear.

See: USS Excalibur (NCC-1664) personnel.