The combination of ham, sweet peach, balsamic and golden crispy bread with olive oil is spectacular. Definitely a perfect lunch or dinner to enjoy the summer with family or friends. I recommend using an artisan bread or campaigne, or a good quality bread as few simple ingredients and dishes it is important to use good quality ingredients.
It also give you the option of using peaches or nectarines, depends on which of the two is sweeter when you go to the supermarket, if not always peaches are ripe or good taste (at least in certain cities like mine).
I share other recipes grilled sandwiches that may interest you