I meant calendar including week days as I some time loose track.
When did diamond become a metal??? I think you'll find it's a mineral. But you are correct that it is the hardest known material.
Do you mean a date display? If so it does display the date!
Ion plated means it is harder than diamond which is the hardest metal in the world I think. It’s like 10 on the Beaufort scale of hardness. Super tough. Great find OP.
Watch doesn't look as good in reality. Can't see the detail. Just looks like a black lump on wrist with a green ring on it.