This vintage jacket is a prewar version of a US army shawl collar mackinaw. The most notable difference from the wartime version is that this is unlined. There are twin breast pockets inside, as well as taped seams. The coat has large patch pockets, with buttoned flaps. The sleeves have buttoned adjuster belts. The jacket has a slimmer, slightly longer cut than the wartime version. This one is pressed to roll to the second button, accentuating that length. It was made by the Lilley Ames company of Columbus, Ohio, and issued to a “Jason Bower”. The name “O. Spencer” is visible directly above, written faintly in pencil. This would best fit someone in the size 36 to 38 range.
Chest (pit to pit): 21″
Shoulder to Shoulder: 17″
Sleeve (shoulder to cuff): 25-1/2″