This is 29mm wide sapphire, made for the Seiko BFK (SKA367, -36, -371, SKA427, SKA577, -579, SKA761, case codes 5M62-0BL0 and 5M82-0AF0).
The height is 3mm at the side and in the middle it is 4,6mm high.
The shape is double domed, so the dome on the outside is also made on the inside, which is the reason this sapphire does not distort the view on the dial when you look at it from an angle.
It has a blue Anti-Refliction coating on the inside.
You can order the sapphire and install it yourself (or have it installed).