Christian Philippsen from Monaco - a reputed concours jury member - sends this picture of a fine vintage tourer and adds:
"I am trying to identify the car on the attached picture. Would you kindly publish it? Someone, somewhere, will know... I have no element of information. Thank you!"
Well that's not a lot to go on, so basically we have the photo, the photo and nothing but the photo showing a gentleman and his spouse(?) waiting till the chauffeur is ready to go. And sorry, just like you thought, the photo came from Monaco but was not shot in Monaco. The backdrop suggests it could be any urban environment in Western Europe or North America. Further, and this is primarily based on the elegant spoke wheels it could be something like Hispano Suiza or Delage, but no the radiator is too much rounded. It may be of help to look close and see that the car has no front breaks. Who will jump in and take the lead?
editor: so far there is some consensus about a Chenard & Walcker Torpedo ( 1919-1925..?)