Crystal for 1958 'His Excellency'

I just picked up this cool 1958 'His Excellency', which is in reasonable shape, apart from the crystal, which not only is scratched and has stress cracks, but seems to have specks of paint on it!

It seems like a special model - low profile, sits almost flush with the bezel at the edge and continues its angle.  Gives the watch a real 'Flying Saucer' look. Very 'Late 50s' looking.  Obviously, most generic crystals would not work.  It's about 31mm diameter.  THANKS!!