Illinois produced a number of very fine watches in this class. The grade 410 may have been the best of these in terms of finish, but the company seemed to elevate the Illini models above even the grade 410. The Illini was sold as a complete watch in a variety of special cases and with special dials. With the exception of the first model produced, with the model name "Illini" the remaining examples are 13 size instead of 12 size and could only be cased in the special cases. When the Illinois company was purchased by Hamilton, the Illini became the Hamilton 400. That was marketed by Hamilton as the Tycoon line in roughly the same price range as the Masterpiece.
You can see a larger picture of each of the movements by clicking on it. To see more pictures of the Illini Family, navigate to the Small Wonders Collection.