This strap was advertised as a direct replacement for my particular Casio watch model. It came in sealed Casio packaging. It was very similar to my old group but with one big difference. My watch has a molded interface with a strap where the molded part is coupled to the strap. The new group didn't have that. Carefully carving the strap with my Xacto knife allowed it to fit the watch with a small gap where there was no gap before. I can't answer the longevity question because the group was only there for a few days.
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