This is a genuine Hamilton D-buckle, priced at 9020 yen. It fits a 20mm lug width. I used this about 20 times in the past when I owned a large Hamilton watch. However, I switched to a metal bracelet, so I stored this after ultrasonic cleaning. It still opens and closes smoothly and functions without any problems. There are some minor scratches from use, but it's still in good condition. I no longer own that watch, and I'm listing this to avoid accumulating more watches. If you're looking to match it with your Hamilton watch, how about it?