One on eBay for £460.00 :
"Original WWII US Army First Special Service Force DI / DUI / Distinctive Unit Insignia / Crest.
The DI is in excellent condition. Die struck with no hallmark, the pinback attachment has a fully working roller catch lock. The DI measures 26mm by 14mm."
https://www.ebay.co.uk/itm/Original-...4AAOSwFuJd0~TM
Then there is the repro version for US$17.00 (£13.02).
"REPRODUCTION WW 2 US Army First Special Service Force (FSSF), Di Distinctive Insignia.
Gold colored stamped metal with red enameling, pin back.
Size is 5/8 x 1 3/8 inches."
https://www.ebay.co.uk/itm/0253s-WW2...AAAOSw241Yf96X