The Salamis Metrological Relief:

This stone, found on the island of Salamis and dated to the fourth century BC, gives standard measures for the orguia (from fingertip to fingertip with arms outstretched), cubit (from fingertip to elbow), foot, and span (from tip of thumb to tip of little finger, with hand outstretched). The cubit here is 487 mm, the foot 301 mm, and the span 242 mm; the orguia is unknown because the stone is broken, but it would be approximately 6 feet or 1800 mm. The stone is on display at the Piraeus Museum.