The 1912 Photograph of Henry and Indy
When Indy and Marcus Brody arrived at the Princeton-home of Henry Sr. in 1938, Indy found an old photograph of himself together with his father, taken many years earlier.
Behind the scenes
The Photograph as seen in the film
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The exact year the photograph was taken is not known. However, the Indiana Jones and the Last Crusade-novelization states that it was taken the year following Anna Jones' death, which would place it at 1913. This is impossible, because Indy looks younger in this picture than he was in the Last Crusade-prologue. The explanation for this mistake seems to be that the information given in the novelization places Anna's death earlier than what was later established. The book The Lost Journal of Indiana Jones gives an update on the circumstances of the photo; it says that the photo was taken when Indy and Henry moved to Utah, which was 1912.
Indy and Henry looks as if they're about the same age as they are in the first five chapters of The Adventures of Young Indiana Jones, when the characters are played by Corey Carrier and Lloyd Owen. It's interesting to note, however, that neither of the two actors are the ones portraying the characters in the photograph. Obviously they had not been cast yet, since The Young Indiana Jones Chronicles didn't start until 1992. The Lost Journal of Indiana Jones provides a better look at the photograph, and here it's obvious that the faces on the picture are those of River Phoenix and Sean Connery. Both images are altered to look slightly younger than they do in the movie.
The 1908 Photograph
The Lost Journal of Indiana Jones also includes another photo, said to have been taken in Princeton, January, 1908. Sean Connery's face is used to portray Henry. Parts of this photo can also be glimpsed during the scene in Indiana Jones and the Last Crusade, when Indy finds the earlier mentioned photo.
The Photographs from the Official Website
When viewing the page for Indiana Jones and the Last Crusade on the official Indiana Jones-website, a small version of a third photo can be seen. This one also seems to show a young Henry with a very young Indy. Sean Connery is not wearing a beard in this photograph.
The original "1912-photograph" is also said to be visible in the background of Indy's home, in Indiana Jones and the Kingdom of the Crystal Skull.