Gualtiero Nativi (Pistoia 1921 - Siena 1999) "Vertical Construction in Red" 1949 oil on board 130x65 cm Signed lower left Signed and dated Florence 1949 on the reverse Provenance Private collection, Siena Exhibition "Nativi100" Museo del Novecento e del Contemporaneo di Palazzo Fabroni, Pistoia, 19 December 2021 - 5 June 2022, p. 115 ill. in catalogue Literature B. Nativi, N. Nozzoli "Gualtiero Nativi Catalogo Generale. Vol. 3" Ospedaletto-Pisa, Pacini Editore, 2023, p. 127 fig. 92 ill. This work is accompanied by a photo-certificate issued by the Archivio Gualtiero Nativi, with n. 4960