
The product description is useless to determine whether 18mm or 20mm is needed. After watching videos of how the measurements are taken, I measured the distance between the watches, not the actual bracelet. I bought the wrong size. The picture shows a 20mm tape on the left and an 18mm tape on the right. 20mm strap does not fit. I recommend removing the strap and measuring the width of the top space that fits between the watch's gap rather than measuring the watch's gap. The gap in my watch was 20mm and the band size of 20mm is too big. Timex expedition watch.

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