Just received my Luma Cinch strap today. I'm very happy with the design and construction, this strap works great and will be replacing my Herringbone Hand Strap.
However, I noticed black marks on my white t-shirt and fingers. After further inspection, I found out that the leather grip (the part that changes the strap length and has its logo) rubs off black dye. I did manager to clean it with a rug.
Has anyone else noticed that with their Luma Cinch? I guess the dye hasn't dried out yet.