This is a copy of the Hephaestion Relief in the Thessaloniki Museum, which system1988 very, very kindly sent to me. It dates to 330-320 BC and is a contemporary, identified portrait of Hephaestion. The inscription says 'To the hero Hephaestion from Diogenes'. Diogenes is believed to be one of the 10,000 Macedonians who returned with Craterus. The relief is believed to come from a temple to Hephaestion in Pella.