Early Thiem built motorcycle.

Cant make out the name on the tank but it looks like a Thiem built machine.

Excelsior and possibly a American/Thiem.

1911 American?

Branded American these bikes were actually built by Thiem.  The company that eventually became Cyclone.

1912 or 13 Thiem.

The Joerns-Thiem company made bikes for Sears and American.  In 1912 and 13 they sold bikes under the Thiem name.  After 1913 they marketed a new model under the name Cyclone.  The overhead cam Cyclones have become the most sought after motorcycles on the planet.