SOURCE: changing the band on my casio oceanus 500 wristwatch
If its an OC500, I just figured it out. There are two sides of the pin visible. One has a dimple and one is completely smooth. Use a small phillips or a punch that is the same diameter as the pin and push on the side with the dimple. The pin pushs in only about 1/4 inch and the smooth side protrudes from the other end. Pull or pry on the smooth end to extract it. The pin is actually 2 parts so be careful not to lose the dimple side piece.
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