O&S - boney

Piece, more a fragment, of bone china found in my garden. Dropped many years ago.

Slightly over 10mm "square" with a delicate painted pattern, I think of flowers and leaves. The top edge appears to be a naturally rounded as a rim and there is some curvature, which matches some of my late mother's best tea service.
Conclusion, probably a fragment of a cup, and probably high quality.