oil on canvas Dimension: 70 x 90 cm  signed and dated lower left "Pištěk 58"  verso signed, dated and inscribed: T. Pištěk "Jam - Session"  Provenance: significcant collection of prominent Czech surgeon    Consulted with Professor Jaromir Zemina, Dr. Jiri Machalicky, Aneta Kopecka and Vladimir Lekes.    Confirmation of authenticity attached.