Good luck with the project. It's a tough ask as most people are pretty precious about their watches. I wouldn't lend my collection out for less than 3% of its value + a contract backed by your insurance company. Others may have differing opinions.
An old acquaintance once loaned his pristine Leica M4 + lenses to a colleague. Said colleague borrowed it to his son, who then wanted it to look more beat up, proceeded to take sandpaper to it.
Good luck with the project. It's a tough ask as most people are pretty precious about their watches. I wouldn't lend my collection out for less than 3% of its value + a contract backed by your insurance company. Others may have differing opinions.