If the TOS designers had had any inkling that we fans would be scrutinizing decals applied to a model kit 45 years after the fact, and if they had had any foreknowledge of Internet-era lingo, then I suspect Constellation's registry number would have been made from two decal sets, with 7s inverted, resulting in a number of NCC-L0L.![]()
Or they might have not shown the registry number at all, just having that section of the ship be one of the parts blown off by the planet killer.