This crown plant is clearly not a rubra form.
You can see the green under the dameged coat of silver scales.
If it was a rubra plant all you would see is a overall intense heavely coated by silver scales.
This plant here can be at least twice times more silver scales. It took some rain that
washed out the rich white/silver coat.
This is an impressive windowsill small Dyckia fosteriana.
That is a sight to remember when in all its glamor dressed.