Yard Sale Find

My mother had a yard sale this weekend and I got 2 of her plates that were for sale (good things is I did not have to pay for them, FREE). I just LOVE my mom.
But anyway, fell in LOVE with them. I did not even know she had these. I am not sure where she had them. I love them b/c they are toile patterned and of course the transfer red or aka pink.
One of the plates is fairly new and I am not sure of the other one. The older one is very fragle and seems very old. It seems to be bone china, with "crack marks" on the clear enamel of it. I am included pictures of both plates and the back of the older plate. If someone know anything about the older plate please leave a comment or email me. I would love to know a little about this plate.
The back of the older plate has the crown, Johnson Bros, England and Old Britain Castles, with a 20 printed off to the side. The front is of Windsor in 1792. PLEASE HELP!
Thanks y'all
Jennifer