My 20' jet has a plate, but there is nothing written on it, it is blank.
When I bought the boat(new), I asked the builder why the plate was blank and said it was because it was 20'.
I asked why put the plate on the boat if you were going to leave it blank? He said they put a plate on all their boats, just in case.
On the other hand, my Clackacraft 16' drift boat doesn't have a plate, I have never seen a plate on a Clackacraft. But, every aluminum drift boat I have seen has a filled out plate. Don't know why, maybe because the Clack is fiberglass.