It is the Crocefisso di San Raniero, a crucifix, that hung for a long time in the kitchen of the convent of St Anne in Pisa.
Other Pisan works of about the same date (as the one in National Museum of San Matteo, Pisa) are very barbarous, and, some of them may be also from the hand of Giunta Pisano[1] before he had achieved his virtuosity (such as S. Benedetto Crucifixion).
A painting of a crucifixion (1236) for the High Altar of the upper church of Assisi no longer exists,[2] but there exists an 18th-century engraving based on a copy of this portrait [3] In the sacristy is a portrait of St Francis, also ascribed to Giunta; but it more probably belongs to the close of the 13th century.
[1] His masterpiece is the imposing Crucifix (1250) in the left transept of Basilica of Saint Dominic in Bologna, with the writing in Latin "Cuius docta manus me pixit Junta Pisanus" (painted by the learned or skilled hand of Giunta Pisano).
Another thoroughly Giuntesque Crucifixion is the right wing of a diptych from the Veneto, found at the Chicago Art Institute.