Pattern 72 PLCE webbing carrier
Very rare and never seen one before, its probably a radio carrier as it has open sides to keep radio cool with a pouch on front for antenna possibly. fits onto belt like a kidney pouch and has buckles to attach straps or yoke.
Part of the experimental Pattern 72 webbing
Label on rear reads
webbing Carrier
5820-99-139-6162
unissued condition