Brand new 5atm water resistant 42mm stainless steel case with sapphire crystals front and back for Hamilton 917, 921, 923, 945 size 10, (10s) family of movements. Features screw on bezel and screw on case back. Brushed stainless steel finish. 22mm lugs. We special ordered these cases cut specifically for the Hamilton movements, no movement ring needed. These take a 37mm-38mm dial (35.75mm viewable diameter) and 22mm band. The crown is Tap 8, (1.1mm) which means in most cases you will need to turn threads down to 1.1mm on the original Hamilton stem, replace you stem with a Tap 8 stem, or replace this crown with one that fits your stem (whichever you prefer). I can supply a Tap 8 stem for $10 additional if desired. See my other listings to see this case with a movement and dial in it. Anything I have listed with a 42mm case is this one. See my other listings for Flieger style dials for the Hamilton 10s movements.