I rather like that approach for early Earth space forays, on the basis that the registry of a ship could just as well be its type description: each ship would be an incremental improvement over the former. That way, some of the type designations cum registries in the list Picard studies in "Up the Long Ladder" might make good sense: it would be possible to identify an individual ship by saying that it is DY-432, but OTOH there might also be a dozen examples of DY-500C.
But Picard's list doesn't support an all-out interpretation of all DY numbers as registry numbers, since there are indeed multiple ships labeled DY-500C. An alternate simple approach, then, would be to say that the DY number indeed primarily refers to the model of the ship, and that it can only help identify an individual vessel in those (rare or common) cases when she's the only one of her type.
Did the DY prefix originate from Jefferies himself? Did he intend for it to be Douglas Yakolev for the American Douglas Corporation and the Soviet Yakolev Design Bureau? Or is this fan speculation based on Jefferies explanation of NCC? Is it Dyson Yoyodyne now? Is this from Okuda or Sternbach or is this more fan speculation based on a joke referencing "The Adventures of Buckaroo Banzai Across the 8th Dimension" and Freeman Dyson?
Where does that "NV class" notion come from? (And wouldn't it rather be "Envy class" unless we get it in writing?No, seriously, we could also be looking at a TOS Jay class thematically named after various birds...)
Didn't you use Triton Class for the ENT Intrepid? Is the NV an abbreviation for Naval Vessel? But didn't that originate from a fan ortho drawing of the ship and this was adopted by other fans? How about a Jay Class for American Continental Congress President John Jay?

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