Sotheby's London . There was some uncertainty about this predella until 1975. Before that date, Bernard Berenson had found that this work, together with a panel depicting a scene from the legend of Saint Sylvester in the John G. Johnson collection, was Florentine and close in style to Giovanni del Ponte or to the Maestro of the Bambino Vispo while Lionello Venturi identified the hand as that of the Master of the Manassei Chapel whose frescoes in Prato Cathedral were drawn upon as a comparison. The attribution in full to Agnolo Gaddi was first proposed by Miklos Boskovits dating it to circa 1380-85 and has recently been confirmed. This panel carried a top pre-sale estimate of £ 80,000.