What puzzles me is that the only photographs that I found (on the airwar.ru website) of the Laté 34 show a passenger cabin with windows above the sponson, which seems to be absent in the photograph which you posted, Mike. Maybe the airwar.ru photographs are not of the Laté 34? Furthermore the recorded history and fate of the Laté 34 doesn't seem to tally with your narrative, Mike. The only other three engine (two tractor, one pusher) Laté hydravion I found was the Laté 50, which doesn't have a passenger cabin with windows (it was a postal aircraft), but I failed to find anything about its history or fate and only one side-on photograph. Maybe the source of your photograph, Mike, can shed more light on this?