A pouch that has clear evidence of carrying pistol rounds , but I believe started out life as possibly an instrument pouch.
Good tan leather in excellent condition, lined in maroon velvet (hence my belief an instrument pouch).
Front face with good clear maker and date 1917 under the closing flap.
Close inspection of the interior shows where ammunition rounds have marked the velvet liner.
Would have been carried via a narrow leather (shoulder) strap.