Patrick Macnee, in the guise of John Steed, the debonair sleuth of TV’s The Avengers, fixes his trouser clip. The still is from “Brief for Murder,” the first episode in the third season of the hit British program. Honor Blackman co-starred as spy-fi colleague Cathy Gale (Diana Rigg wouldn’t appear until Season 4.) Macnee and his trusty rod-brake bicycle are parked alongside the river Thames, between Ham Dock and Teddington Lock. The episode premiered September 28, 1963.