LS150 and up are Nitro, which they call lacquer.
LS85/90/95/100 are poly.
The poly finish is very thin, I find it difficult to distinguish between their poly and nitro finishes.
Here's an example of a poly finish, an LS90 plaintop, Violin Finish(Honeyburst)...my guitar.
all the LS90 plaintops have this type of grain.