Pick a brand that names its full-grain leather and shows it up close. Check...

https://spark-wiki.win/index.php/How_Does_a_Leather_Watch_Strap_Break_In_Over_the_First_Year%3F

Pick a brand that names its full-grain leather and shows it up close. Check seams and edges in clear photos. Read the warranty: what is covered, and for how long? For initials, see if they are pressed, stamped, or etched, and where they go