Rare WW2 US 3133rd Signal Service Company DUI Sterling Pinback

Good condition, excellent enamel work. Crest is 1/2 inch, pinback sterling 1/20 10 GF. These crest are extremely hard to find as are the unit patches. The 3133rd was one of 2 active sonic deception units during the war. These crest do not come up for sale often.