Here is a Illinois Watch Case Co. 18 size, Gold Filled, Hunter Case. 

This Case will only accept a very Thin 18 size Movement. The Dueber-Hampden, 18 size, M2 / M4, Movements are too thick so the Dust Cover won't close & the Bezel won't seat. Perhaps this Case was made for E. Howard of Boston as their Movements are of unusual size & perhaps width.  

Anyroad I currently have this one up for auction on e-bay as none of my Hunter Movements are thin enough to fit this Case.