The Lucca Crucifix
Local legend has it that this crucifix was carved at the time of the Crucifixion by Nicodemus and that it arrived in Lucca miraculously in 782. (Source, also see Holy_Face of Lucca)
The St. Catherine monastery's Savior, however, is considered the oldest image that survived the Iconoclasm:
The oldest known surviving example of the icon of Christ Pantocrator was painted in encaustic on panel in the sixth or seventh century, and survived the period of destruction of images during the Iconoclastic disputes that twice racked the Eastern church, 726 to 787 and 814 to 842, by being preserved in the remote desert of the Sinai, in Saint Catherine's Monastery.[6] The gessoed panel, finely painted using a wax medium on a wooden panel, had been coarsely overpainted around the face and hands at some time around the thirteenth century. It was only when the overpainting was cleaned in 1962 that the ancient image was revealed to be a very high quality icon, probably produced in Constantinople