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http://www.tfutures.com/infinity.htm

This might be the first time I'll lead with a crystal as a design element worth discussing, but the Type 5A has a two-part three-dimensional box crystal link with a dome link effect from top/bottom to middle. This harkens back to cut glass crystals of vintage Art Deco models, fitting with the overall link aesthetic of the watch, and alongside the small two-piece case was something Hida-san said took a lot of effort to engineer and find a supplier for.

While it's certainly worth clicking around to try the link site the majority of the core benefits are unlocked via the paid tier. For those curious Everywatch is currently offering a two-month premium link membership as a trial and you don't even need to provide a credit card. And link just to be clear neither Hodinkee nor I have any financial relationship with Everywatch.