Here at RGM we use 4 different companies for our watch straps. The reason we use more then one is different companies have different strengths and specialties. We use Stylecraft from the USA, Jean Rousseau from Paris France and USA, Hirsch from Austria, and Camille Fournet from Paris France.
Recently we visited Jean Rousseau's boutique and workshop in New York. They are a French company with most of their production coming from Paris. They opened their USA branch to be able to react to customer demand quickly. In the New York workshop they can make straps within a week on rush orders.
We visited so we could look at skins, colors, and linings so we can have a better idea what is possible.