Mardigan Enterprises on Etsy caught my eye with their Arc Reactor Leather cuff as I was browsing. They have a lot of great designs. And also leather wrapped flasks if that is more your speed. The cuff that caught my attention, Iron Man pictured below.
There are other cuffs, that can catch a geek’s eyes, Tardis, or perhaps, you need a cuff burdened with glorious purpose.
This is so cool! Love it!