H-Tradition HIRSCH buckle for watch band, stainless steel
Watch strap - Wikipedia
Have A Perfectly Fitting Watch Strap With This Tactile, Adjustable Strap Buckle By Roland Iten: It's Both Useful And Relatively Affordable - That's Win/Win! - Quill & Pad
20/22/24mm Custom Leather Watch Strap Buckles – Metal Field Shop