Most photos of this era are not as good as this one.
Can anyone say what kind of car it is? Are those Dietz side lights?
yes dietz dante flat back. charley
It has several features that are similar to a single-cylinder Packard, but it's not. Certainly 1903-4 one or two cylinder, large and expensive.
I believe all 1&2 cyl Knox's (Knoxes?, Knoxen?) used longitudinal springs like a Curved Dash Olds. I also think they had very offset differentials (over to the extreme left).
If you look at the left side of the car you can see the reflection of the camera man and his tripod. I would say that s a good indicator of the sheen on the car surface.
The chain drive and box-shaped structure with louvers just might suggest mid or rear engine,.....?