I assume it has the full bottom marking doesn`t it ?? Can you post a pic of the pot and the bottom marking ??
There is little available on this company due to its short life !! I did find that it was purchased in 1903 by James Miller, Charles Golden and James Armstrong but I did not find from who it was purchased !! It was located in Roseville, Ohio !! There may be a connection between the Roseville pottery we all know and Progressive but I did not see a direct reference to it !! The pottery from Progressive is fairly rare so additional research would be needed to establish any value it would have !!
Someone mentioned that a bean pot was on Ebay recently,, was that yours ??