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This leather holster, marked with "Warren Leather Goods Co. 1917," appears to be a U.S. military-issue item from the World War I era. The "U.S." embossed on the front and the date indicates it was produced for the U.S. military around that time. The writing on the back, including "190 FA" (likely standing for 190th Field Artillery) and "VN," could denote the unit or service details of the soldier who was issued this holster.
This kind of item would have been used to hold a sidearm, probably a .45 caliber M1911 pistol, which was standard issue for American soldiers during WWI.