Got this from http://abstrusegoose.com/about:
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| Group Photo of Scientists |
Not sure when it was taken though. Tried to enter a date in the 1920s in Picasa, but it does not let me do any date before epoch.
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life one-dot-two degree north, one-o-three-dot-eight degrees east 
photo should be made between 1921 and 1928 (dead of Lorentz)
1927
This would be from the 5th Solvay Conference on Physics, in 1927.
Here’s a link to Wikipedia, with a high-res version of the picture : http://en.wikipedia.org/wiki/Solvay_Conference.
Re: 1927
Fantastic! Thanks for the pointer, very, very serendipitous!