Yes, as mentioned it is a DUI for 23rd CA Harbor Defense, and a scarce early pre war version. They were worn in pairs below the US on the lapel notch and on the Garrison (flat) cap by enlisted men, and on the shoulder straps above the rank insignia by officers.
These insignia were also made with screw back fasteners as well.
Army "DIs" as they are called, were generally dispensed with once the war began, but commonly an popularly worn again at the end of the war by servicemen who could get them.
CB
Last edited by cbuehler; 12-06-19 at 03:44 PM.
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