I'm guessing that this was a publicity 写真 of Clint Eastwood from the studio. Could this be the be the beginning of film crossovers? Dirty Harry vs. The Good, the Bad and the Ugly? (image found at vintagepics.centerblog.net)
@Warner Bros. -Clint Eastwood’s relationship with Warner Bros. began in 1975 with the signing of a long-term pact, and Eastwood’s Malpaso Productions moved onto the studio’s storied lot.
