Is there anything of which it may be said, “See, this is new”?
They are usually small enameled coat of arms, which often depict symbols of the history of the unit they represent and the sometimes have the motto of the unit. Army units may go back to the early history of this nation this class of insignia and the idea of a unit heraldic crest is relatively modern.
Our one example although postwar still uses a post and screw and the other has a unique safely pin like attachment.
This pin-back has the manufacturer's hallmark 1E for Emblem Supply Co., Inc of Central Falls, RI.
DIs were worn on the front of the campaign hat, on the standing collar of enlisted men's coats behind the collar disks, and on the shoulder loops of officer's coats and on the lapels of enlisted men's coats.
DIs were worn on the left side of the overseas cap (garrison cap) when that was reintroduced, and moved from the standing collar to the lapels of enlisted men's coats when the lapel coat was introduced in 1926.
The early Christian Church Fathers constantly argued with the pagans about the age of the earth, or about the age of civilization.
During the next two decades they were approved for most regular and national guard units.Many units tried to circumvent the rules and had ones ones manufactured in plastic or in silver. The unit was formed in 1942 and inactivated November 1945 in Germany.Prohibitions against wearing DIs in combat zones also existed. This is shown as an example of a good World War Two era pin-backed, open catch DI typical of this manufacturer.If trimmings are adopted, the color should have some historical significance connected with the regiment.Colored trimmings will not be worn with the cotton service or white uniforms. Where insignia or trimmings other than those indicated above are desired, the reason for variation must be made plain when the approval of the War Department is requested. If a distinctive insignia of trimming is adopted, it must be worn by the entire personnel of the regiment and the expense of adopting and wearing it must be borne by the personnel, as personnel, as public funds are not available for this purpose.Pin-back DIs were still manufactured during the postwar period.Once American Forces were on occupation duty in Germany U. Army Insignia were manufacturer locally and some unusual variations were produced.It does seem to me that the oldest ones are mostly screw back construction and that pin-backed ones became more common over time.On December 29, 1942 it was announced that the manufacture of distinctive insignia was to be discontinued and that future requests would only be considered under very special circumstances.The earliest distinctive insignia were either screw post and retaining nut or pin-back construction.The pin-backed ones would have been useful on officer's shoulder loops while the screw backed ones would have worked well on the Montana peak campaign hats in use prior to the general adoption of the garrison cap.