Manufactured by François Haustgen 1902-1904.
33, Rue de L'Esperance, Paris.
Also listed as Haustgen and Roussin, a Haustgen motorcycle was presented at the 1902 Paris Salon.
Produced Iris air-cooled and water-cooled IOE motorcycle engines, and Iris motorcycles.
The Gloriator used Iris engines.
Francois Fernand Haustgen patent GB190223658A: Improvements in Clutch Mechanism for Explosion Motors Principally Intended for Motor Cycles, published Feb 1903.
Sources: Bourdache (p146), lva-moto.fr, patents.google.com
Notes
The Iris brand was used for French, British and Italian motorcycles, and also for British sidecars in the 1920s.
