50k - 250k minimum. High-end watch afficinados would gladly pay 100k plus for a bespoke hand made band like yours. In fact, if you charge less, they will question the quality. The higher the better. Error on that side and give it a great presentation. When I had a Rolex and other high-end watches, I wouldn't dare put a cheap strap on them. They will also buy multiple bands so they can change them out at will to change their look. These are people who can afford it.