The Ithaca guns were smokeless compatable prior to the Flues.
According to "The Ithaca Gun Company - From the Beginning" by Walter Snyder:
The Lewis model (1901 - 1906) was introduced "to accommodate the new powders".
Followed by the Minier model (1906 - 1908), followed by the Flues model (1908 - 1926).
It's a fine book.
Offered FWIW.