You can't really look at the ship design anymore to identify the time a vessel was built.
Can't say I agree with this in the slightest. I mean, with the exception of the Titan having a Constitution Class saucer, everything else is different. And even that saucer is heavily modified with cut outs, very different upper saucer, umpteen impulse engines, phaser arrays, etc.
To my eyes, they've done a pretty good job separating the various design eras.
From the NX-01 and her various contemporaries.
The early Disco ships.
The Kelvin and similar ships.
SNW Enterprise and Farragut / TOS Era
Refit Enterprise and late 23rd century
Galaxy Glass and all it's many contemporaries.
Sovereign class / Dominion war
Late 24th / Early 25th Cenutry
32nd Cenutry
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