New treasures found

I just can't resist old glassware, I buy oddball pieces whenever I find them, I bought these at an estate sale, I do have several more matching pieces but I really don't know anything about them, I enjoy researching items I find.
The only thing I have been able to find out is the Johnson Bros made china in England starting in 1881, but I haven't been able to find out anything about the "Rose Bouquet" pattern, I would love to know when this was produced and for how many years. The green "N" on the plate is under the glaze, as with all the pieces, if anyone can help me with some details I would be greatfull.