DJ 162xx project watch is 8 or 10 years old with Seagull TY2806, ST oem spec bezel/sapphire crystal & gasket/case tube, riyi hoods, brass mvt spacer w/screws and clamps. WR tested to about 30M.
Clasp from parted out '21J Daytona' from 2010 or so. Long, low tension spring bars can be easily adjusted with a toothpick.
Silicone 'Aero Classic' airplane tire style strap from eBay.
Aero Classic 27 Sc - 10 Ply Rib Tread Tire | Aircraft Spruce
High Quality Waterproof Diver Rubber Silicone Watch Strap Band 18 20 22 24mm | eBay
Seagull Caliber TY2806 Watch Movement | Caliber Corner