Pair Of Antique Longchamp Earthenware Handpainted buying "Old Mark" Moustiers Plates

buying Absolutely beautiful is the one way to describe these two antique pieces. Please note size of dinner plate, as it is 10 1/8" , and also, the "old mark" on the back. Handpainted, Longchamp earthenware. This pair includes the dinner plate, and also a bread and butter, or salad plate that measures approx. 7 1/2" These dishes are in excellent condition. I do not see any knife marks, and believe they must have been kept in a cabinet, and either never used, or rarely used. The old mark is difficult to see on some of them, but they are all from the same set. The plates and mark shown is representative of the lot.