You see this color a bit more often with the older model years, rarely on the Fuselage generation, think availability ended after 1970. My favorite Imperial apart from the late 50s would be a 1970 Crown in this color inside and out sans vinyl top. Here's a 71 interior in this hue compliments from Fuselage.de
The ultra rare color was M8 Sparkling Burgundy Metallic which is just one step lighter and really shows the deepness and beauty of the color. It was only offered in 1971. I've only seen one car ever (Imp) in person with that color. I believe there was one or two Imp's posted on FCBO with that color in the last 3 years.
Both the M9 and M8 cars look outstanding with brilliant sunshine shining on them!