Thanks grob! I had my post ready to go when the great crash occurred. Fortunately revival appears to be at hand.
The only reference to Seidl & Naumann that I could find says: "In 1905, the company developed its own automobile manufactures. The vehicle with the model designation 34/40 hp was 1905 at the Herkomer Competition used. It is unclear whether other vehicles emerged." Apparently they made a 60 hp as well, or my reference is in error with its model designation.