Italian White Porcelain barn container with lambs and flowers

I purchased this at an estate sale in Pittsburgh. The flowers and leaves and birds and chickens all have very nice detail and seem of higher quality, so I am wondering what it is, who made it? On the back is a hand-written under glazed signature S.6315/A and Italy. There is crazing and a number of chips. I looked all over and can't seem to find anything quite like it. Would love to know more! Thanks in advance....