Glazed pottery. Made of red fabric with white slip and cream coloured glaze.
Two panthers on both sides of a tree, in sgraffito technique, characteristic of the (Byzantine) 12th century.

In 2007 I ran into a special exhibition dedicated to Byzantium. I took pictures, maybe some objects were on loan from elsewhere. This might be one.

Sgraffito (plural: sgraffiti; sometimes spelled scraffito) is a technique either of wall decor, produced by applying layers of plaster tinted in contrasting colours to a moistened surface, or in ceramics, by applying to an unfired ceramic body two successive layers of contrasting slip, and then in either case scratching so as to produce an outline drawing.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Land of Civilizations, Turkey’ – Catalogue of the Fukuoka Exhibition (Japan), 1985 & Wikipedia.