Back snaps down, protection is limited. Hardened for extra strength. Thinner, more fragile. Tested to seal out water to depth shown on case back. Ranges up to 500 feet.
Gold plating is over stainless steel.
If it wears through, the case retains its beauty indefinitely. Plating on case and crown is 5 microns thick. Gold plating is over brass or other. When it wears though the beauty is lost. Copyright Their Respective Owners.