I took a close look at this strap and it turned out to be a genuine Seiko strap. The group was in a plastic box marked SEIKO, 4FY8JZ, BAND CHINA. I know that Japan now makes products in China, so I don't think it's a problem that the tape is made in China and not Japan. Also, there are "thick pins" in the package, which are larger in diameter to fit the band snugly, but you can use your original pins if you prefer. The strap is a bit stiff but I know it will soften after wearing. I'm not sure why it's called "crooked line" unless it means "ripples" on the strip. If you look closely at the bracelet, it appears that it's made up of two layers: a smoother top layer and a more durable plastic bottom layer. It appears to be a real design.
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