Bradbury is not a conjectural class name. It is first mentioned in the episode "Brothers" on an Okudagram. As for the Rigel, the class name is seen in the same episode, as the class to which the USS Zhukov is associated with, before a recon made the ship an Ambassador-class vessel.
Thanks for those. Also, the Apollo and Korolev class names appear in Okudagrams as well.
Registry numbers are an unreliable tool for gauging the era to which a class belongs.
It depends on the circumstances. See below.
We have the Excelsior-class USS Melbourne with its NCC-62043 registry number as an example of why this is so.
That particular instance was a snafu. That registry belonged to a Nebula class ship before they changed it to an Excelsior, and didn't bother to change the registry to be more logical. Same with the Crazy Horse. It was listed as a Cheyenne class with a 5XXXX registry before they showed it on screen using stock footage of the Excelsior class. All other TNG-era Excelsiors have more logical 3XXXX to 4XXXX registries.
There needs to be other evidence to indicate when a class might have come into service. Like, for instance, the Korolev is probably a 24th century class, as the USS Korolev of the 23rd century was a Connie. This is based on the visual evidence seen in ST VI.
Actually, there's no evidence the TUC Korolev was a Connie. We only know the registry number, not the class. But it's doubtful that it's the class ship of the TNG Korolev class.
And on the subject of registry number evidence: While it's true that registry numbers can be an unreliable tool for gauging the era to which a class belongs, there are some factors that can be possible evidence of build times:
1. The Andromeda-class USS Drake was probably commissioned just after the Wambundu-class Drake was destroyed in 2364. Given that the registry perfectly corresponds with this date, this is evidence that the Andromeda class is a new TNG-era design.
2. On the subject of the Wambundu class, both known ships have registries of 203XX. The fact that the old Drake could only max out at warp 3 would mean that it was built before the warp scale was recalibrated for TNG, since that statement would be utter nonsense otherwise (i.e. Warp 3 in the new TNG scale might correspond to Warp 6 in the old TOS/TMP scale), and the class is a much older design.
3. The four known Apollo class ships all have 1XXXX registries. Since we never saw any Apollos on screen, it's possible that they simply didn't build all that many, and the ones we know about have registries that most likely correspond with their build times. We know that the Apollo class Ajax NCC-11574 was operational in 2327, so the class had to have been commissioned at least before that date.
4. The Bradbury is definitely a new class in the 2360's per its NX-72307 registry.
5. Both known Deneva class ships have 6XXX registries. Like the Apollo, since we never saw any of them on screen, it's possible that they simply didn't build all that many, and the ones we know about have registries that most likely correspond with their build times.
6. We know the Hokule'a class Tripoli NCC-19386 was active in 2338, so the class had to have been commissioned at least before that date.
For 2271 to 2305, I know of another class that entered service: the Lancelot-class.
Stay tuned for my petition to have its anachronistic design changed
