From the WWII Coastal Artillery group I purchased. There were three DUI's. One from Coastal Artillery School and one for the US Army 503rd Coastal Artillery. This one has the motto Pro Patria (For Country) but this motto was for the US Army 31st Infantry too. Obviously, this is not their logo.
This DUI was made by H.R. Newcome in New York City. I was unable to get any information on the maker too. Any help would be greatly appreciated.