OSWALDO GUAYASAMíN (1919–1999), ECUADORIANRETRATO DE MERCEDES YCAZA PAREJA DE YLLESCAS BARREIRO Y SU HIJO FRANCISCO YLLESCAS YCAZA (AT GUAYAQUIL)Oil on canvas; signed “Guayasmin” upper left, titled, dated circa 1941 at Guayaquil to the accompanying Certificate of Authenticity from Juan Castro y Vela