I’ve not yet found a great deal of information into the production and use of these old denim US ARMY fatigues. With so much militaria being of OD Green and khaki descent, denim pieces are seemingly unique. After finding a few other examples of similar jacket labels, it’s safe to say that this item does date back to the 1940s and was succeeded by a few other denim jackets before the army discontinued. This, the earlier version, has amazing zinc embossed buttons which are surprisingly thin, yet sturdy. The lines on the jacket are much like you would see on any civilian chore jacket. Which makes sense as the military often times contracts from suppliers who also make civilian work wear. This one here is missing the neck tag which would have had the pertinent information. Manufacturers of this style include Reliance MFG and Lutece MFG.