Chinese Longquan Celadon Bowl, Shipwreck Piece?

A Chinese Longquan bowl with an olive green celadon glaze and grooved exterior, probably dating from the Yuan or Ming Dynasty. The bowl may have been salvaged from a shipwreck as there is degradation to the glaze (most notably on the exterior) and small signs of marine growth. Measures 19cm in diameter at the rim and 9.5cm tall. A section of the rim appears to have been broken off and re-attched (see photo 10) and there is considerable crazing to the glaze. Please see all photos for confirmation of condition.