A cars build date and registration date can be months apart as can 2 identical cars built one after the other.

If a dealer has a car it all depends on if it was ordered for a customer or for stock. It could sit on the forecourt for months.

My Neuveo sapphire is a facelift, electric sunroof, aircon, sharktooths, no numbers on the fuel gauge, rev limit highlighted in red, 4 spoke steering wheel but No colour coded tip on spoiler

Mines a april 92 build and May registration but not one of the last.

I would think the last batch would be from July 92 through to July 93 and be on K or L plates.

with regards to evidence, i have the German sales book that states - Wagenfarbe Heckspoiler (body coloured boot spolier) and this picture.