Oil, tempera, canvas, cardboard Dimensions: 21 x 26,5 cm Signed lower right "J.Z." Verso signed and inscribed   Provenance: significant collection of Emil Gilels (acquired by Emil Gilels from Jan Zrzavy)   Exhibited.   Consulted with Professor Jaromir Zemina, Dr Karel Srp, Dr Jiri Machalicky and Alena Havlikova.   Confirmation of authenticity attached.