Chinese Carved Tuan Stone Panel in High Relief

possibly 18th century, carving of grass and crabs, natural brown coloration with shades of green and purple, poetic inscription and artist's seal to verso, sight 10-3/8 x 11-3/4 in.; framed; accompanied with additional documentation describing the panel as "One Chinese 18th Century Twan Stone..", from Dragon House Oriental Fine Arts and Antiques, San Francisco, CaliforniaProvenance: Private Collection
Condition Report: some chips to grass, one crab has crack in back leg, some gouges to panel verso, restoration to corner verso, and other scattered nicks, scratches, abrasions, and typical surface wear consistent with ageÿ