By the Gods!

Robert Hundar and Mark Forest, as Maciste (Poseidon in US version), agree to a sword duel...blindfolded, in MACISTE - GLADIATOR OF SPARTA (1964; Maciste, gladiatore di Sparta, aka Terror of Rome Against the Son of Hercules)

This scene is really cool. One of the better moments in this fun and sometimes serious movie. Though he's not credited anywhere, I'm 100% certain that Alfio Caltabiano contributed to the scene, as either stunt coordinator and/or as stunt double to Robert Hundar.

Marilù Tolo and Franco Cobianchi look on as the two blindfolded men try to kill each other.