This is a museum-class super vintage piece, distinct from the 1940s shawl collar denim jacket! It's a masterpiece from the 1910s-20s, over 100 years old! 【Background of the dungaree jumper】 The U.S. NAVY uniform regulation "Change 17," issued on March 18, 1918, introduced a 5-button type, replacing the previous pullover type. After its introduction, there were no significant changes to the well-known 1940s model at first glance. The pullover type became a zipper type and existed alongside the 5-button type until the 1930s. 【Product Details】 Points that follow the 1910s pullover type: 1. No bar tacks on the front pockets 2. Buttonholes are sleep holes 3. Sleeves are attached externally to the body 4. Bar tacks on the sleeve cuffs 5. Front pockets are positioned lower 6. Sleeve and front pocket fabric is reversed in orientation 7. Armholes are slightly narrower 8. The keyhole is slightly larger These features are generally not found on the 1940s 5-button type. Furthermore, the sleeves were no longer externally attached by 1924 at the latest, and the buttonholes were changed to grommet holes in later years, indicating that this was manufactured before 1924. This piece is clearly different from the 1940s 5-button type and shares many specifications with the 1910s pullover type. Therefore, it is concluded that this individual is a transitional to early model of the 5-button type introduced in 1918. There are many other attractive points, such as the selvedge on the back of the front pockets, and above all, the rough atmosphere of denim from over 100 years ago is exceptional. This is a super vintage piece that is rarely seen on the market, and there may only be one in the world that exists in such good condition. It will be expensive, but if you like it, please take this opportunity! 【Condition】 Dark navy with over 90% color remaining, in excellent condition. There is a 1cm separation of fabric due to a stitch break on the back of the collar, but there are no tears and it can be easily repaired. 【Notes】 Please understand that there may be slight measurement errors. Please understand that this is used & vintage clothing, and no claims or returns will be accepted after purchase.