Orient China Japan...M

On the bottom there is a wreath, inside it says Orient China, at the top is has the latter M, below it says japan. I have a dinner servis, 12 dinner plates, 12 side plates, 12 smaller plates, 12 soup bowls, large turkey serving platter, turine, gravey boat plus 2 other seving items. , tea service, Tea Pot, Sugar Bowl, Milk Jug, 12 tea cups and 12 saucers. , all in exelent condition. I have no idea where it came from or when. I was my mums, she died 1981. How lond she had it iv no idea. Could you help me with an Appraisal ?