Posted by Jeremy at 13:00 on 2012 Jul 21
OK, mystery solved, thanks to Paul’s contact Mike Worthington Williams, who says:"It’s definitely a Buick. Buick adopted drum type headlamps (which these are) in l922 but the car cannot be later than l923 which was the last year in which this shape of radiator was used (1924 had a curved "upper lip")"This is consistent with another photograph in the collection of Knox-Shaw images from Helwan of a Burndept Ultra IV receiver that was sold in 1922/3. K-S left Helwan in 1924Go well!Jeremy