I had avoided mounting my 1039 on my SM300 for the longest time as I felt the same as you. It just didn't feel as though it was substantial enough to take daily wearing and the last thing I wanted to do was ruin it or stretch out the links.
It came as a great surprise that the 1039 actually wears extremely well, and feels way more durable that I would have ever guessed. I love it so much that I still haven't taken the bracelet off. I highly recommend this bracelet.
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