These are straight jeans by Bobson, and since they are made of American fabric, they were probably manufactured in the early 1970s. According to the data, Bobson was established in 1950 as a manufacturer of school uniforms under the name of "Yamao Hifuku Kogyo", and started manufacturing and selling "Bobson" jeans in 1971, changing the company name to Bobson in 1973. The products introduced here do not have "Yamao Hifuku Kogyo" written on the flasher, etc., so it is assumed that they were made after the company name was changed. The model number of the product is not clear, but since the patch says "S28", I assume that this is the model number and have included it here.
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