1939 Air Ministry Marked Leather Jerkin.
In nice used condition with only one small hole to the leather, this does not go thru the inside cloth liner, the two cuts across the shoulders in my opinion are deliberate to make the jerking fold along the wearers shoulders, the cuts do no go into the interior lining. Clear AM mark and code to the inside. Size i would say is a medium. Nice to find a RAF jerkin and one with an early date.