This is LEE's Boys Youth, and based on the inner tag, it seems to be from the late 1950's to early 60's. 11.25oz right twill denim is used, or the fabric seems a little rough compared to Levi's 501 of the same age.
The long length makes it look quite slender, but it's not particularly thin and straight. The silhouette is almost non-tapered and straight to the hem.
This flasher has an illustration of the "Steer Wrestling" competition in the rodeo. It lists various information such as the part number, the number of ounces of fabric, and the product warranty." The label "C1955 BY THE H.D. LEE COMPANY" indicates that it was manufactured at least in 1955 or later.
A tag attached to the top of the patch. The waist size is listed as 26", and LEE is often made larger than the size listed, but this is because it is called "Slim", so there is no big difference between the size listed and the actual size.
The absence of "RIDERS" and the absence of "○R" and "M.R." suggests that this was a product from the late 1950's to early 1960's.
Left hip pocket. As is often the case with boys' youth models, it's patched and the stitching is a straight stitch rather than a lazy S. The patch here is made of leather, not PVC.
Unlike the adult models of this period, it also comes with rivets. The adult models are also different in that UFO rivets are used, including other rivets.
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