Hermes Bands Guarantee
my Hermes band has been changed in color around the edges, although its 6 years old. I would like to know is there any service provided by Hermes for the leather bands sustainability or exchange?
Apple Watch, watchOS 4
You'd have to contact Apple. This is a user to user only forum. My guess after 6 years would be no, at least not under warranty. Leather is a product that changes in appearance over time with use. But Apple is the arbiter of items purchased from them.
Just like all accessories Apple sells, they come with a one year warranty against manufacturing defects.
Use the Get Support at the top of this page to reach Apple.