This plate is surprisingly similar in several respects to plates made in the same style by the French China Co., often marked "La Francais". That company often used decals (as opposed to transfers) to decorate the centers of its plates, the difference being that transfers were applied under the glaze, while decals were placed on top of the glaze. Your plate has such a decoration.
Also, many of the French China Co.'s plate shapes had a very similar embossed decoration around the border that would have been formed when the plate was press-molded into its shape. Either this particular mold was made by the same modeler that cut many of the French China Co.'s molds (they are VERY similar, but not identical), or else a competitor went out of his way to copy products of the French China Co. in making this plate. Since most of the French China Co.'s products proudly carried that potter's marks on the back, this example, if made by that potter, would be the exception to the rule. I'd guess that the chances are at least 50-50 that this plate was made to copy a commercially successful "La Francais" product by a small pottery (around the turn of the century) that you won't discover the identity of unless you can find a marked example.
PS. Unless this pattern already exists somewhere in the PID, you can submit it to Eric Brown and name it yourself. Pick a name that fits, something like "Grandmother Peterson's Roses."