Gerard David, ‘Archangel Gabriel; The Virgin Annunciate’, ca. 1510, The Metropolitan Museum of Art

left wing: 34 1/2 x 11 5/8 in. (87.7 x 29.5 cm), painted surface 34 x 11 in. (86.4 x 27.9 cm); right wing: 34 1/2 x 11 3/4 in. (87.6 x 30 cm), painted surface 34 x 11 1/8 in. (86.4 x 28.3 cm)
http://www.metmuseum.org/art/collection/search/459062

About Gerard David

Netherlandish, 1460-1523, Oudewater, Netherlands, based in Bruges, Belgium