Bought this for my old 6039-729a. I've had anniversary straps on other Seiko's and similar ones on other models. This one is flawless. They fit without any alteration and after adjustment (which I have the right tools for and without which it is almost impossible unless you go to a competent watch shop) they are comfortable and elegant. The clasp is strong but not difficult to use, just smooth. Yes the watch has a few modifications but I like it.
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