Congratulations; it looks lovely on you! 😍 If I’m understanding your concern about the buckle placement correctly, I don’t think it’s an issue; the buckle’s placement will vary depending on wrist size and what hole you fasten it on. But I’ll let others weigh in, especially regarding Cartier customizing strap size which they can do on custom orders.
It does look like it’s a little tight on you; how does it feel? I prefer to wear my watches a bit looser and would probably put it on the next loosest hole, so it wasn’t digging into my skin, but if it’s comfortable to you then disregard! Also, the leather will continue softening and stretching slightly as you wear it, so maybe in time it will be more comfortable at its current notch. Enjoy! 💙