My best guess is they are 1916 or slightly later Cadillac's . The hood louvres are distinctive and the "clean sides"...no external door handles.
The shape of the top and frame fit the Cadillac.
The 1913 Cadillac is much different and not as "sleek or stylish" as these cars are.

Dale Nicol on 18th September 2018 @ 3:55pm

I'd probably call it a 1916 Haynes Light Six. Note the three oval windows in the rear with the classic Haynes H in the center window, the round emblem on the front end, and emblem on the radiator cap.

JKG on 18th September 2018 @ 5:15pm

JKG is right on!
I missed the Haynes H in the rear windows, but the body styles with Cadillac are strikingly alike.

Dale Nicol on 18th September 2018 @ 6:11pm

I guess the "H" is a giveaway if you know what you're looking at. Good work! I'm wondering if it could be a 1918, though, to match the plate.

Arthur on 18th September 2018 @ 6:25pm

And a guess as to who might be in the picture: E. A. Franz was the local agent for Haynes in this era, according to his ads in the Glacier. I would guess he would put himself behind the wheel for the promotional photo, though there isn't enough detail visible for me to be sure.

Arthur on 18th September 2018 @ 6:35pm

Arthur, I found some old Haynes sales info with artist drawings. The car can't be a '13 based on the photo. In 1914 Haynes made a design change to make the car look sleeker, so chances are it's closer to a 1918 model.

Dale Nicol on 18th September 2018 @ 7:21pm