This appears to a case like the long lost deleted Esther Muir scene from A Day at the Races, i.e. I have a set of the Klondike episodes from 16mm film transfers and that scene is not there. There were 18 episodes made (according to Wikipedia) but IMDB say there were only 17 episodes made. The set I downloaded contained 16 episodes, with episode #10 missing. According to IMDB episode 10 is lost and not in the archives, but it can't be from that episode because Joi Lansing did not appear in that episode anyway.
All I know is that the series was made in black and white so that color photo must be a promotional still photo, but no such scene exists in the available episodes. I doubt we will ever find footage of that scene.....
It is the same story regarding the wetlook pics of Sally Field with Pete Duel in the pool from the "Gidget" tv series. I have checked all 30 episodes from tv airings and from the dvd release and no such scene exists in any episode.
...but I did find the rare wetlook scene with Cher and Mcclean Stevenson that is mentioned in another thread below.