Diver extension is a must. I bought it for my green Sumo Seiko SPB103. Summer smelled like my wrist, so it made sense. One downside I'd like to share, at least on my particular watch, was that the clasp didn't come with heavier 18mm spring bars to replace the old clasp. I was using my old 18mm spring bars from an OEM strap and the watch actually fell onto my patio. !I am currently looking for the right size for my closure.
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