I think something more is needed.
If I look at this picture, I see a prewar classic car.
Nothing special or particular. Probably the bodystyle, with those wood inserts, but beside that, if you google what you see, no-way you find it.
A Dort car is no obscure at all, but here, we are not even sure it is from the States, and Dort cars do not distinguish themselves.
You said it resembles a GM product...ok, I can't see that but can't argue...but quoting your source, Wikipedia, why not Oakland, Oldsmobile, Chevrolet, Durant, Winton, Welch, McLaughlin, Sheridan, etc etc etc that were GM products?
However, following your intuition, you guessed:
A circa 1922 4 cyl. Dort?
...but if you google 1922 Dort, you'll find a perfect copy of the puzzle car, in at least 3 websites:
http://classiccarslist.com/other-makes/15500-1922-dort-19t-for-salevery-rare-amp-originalruns-amp-drives-fantastic.htmlhttp://www.webeautos.com/detail-1922-dort-19~t-for_sale-used-12970314.htmlhttp://www.findnicerides.com/1922_Dort_19T_Riverhead_NY_249580278.vehwhere you can read the exact model: 19T Sedan.
But if you use GSI, you'll find only this one:
http://www.hmautos.nl/occasions.aspx?aid=2108574&did=2586&herkomst=gplWhere you just find that is a 1923 (circa 1922!) 4-cilinder Dort.
You studied the car and had this intuition...it could be a Dort!
If you google "Dort sedan", you'll find 2 of those 3 results above in the 1st page!
You go there, compare the pics and you'll know that it's indeed a Dort Model 19T!
Why the question mark? You didn't check it? So it was just a guess? One of the thousands of cars with the same appearance?
Furthermore Dort models where few, very few...you recognize it but did not take few seconds to find the exact model?
I hope you see the way it seems from 'outside'.