The so-called "crown" inlay is actually a representation of a flower pot, according to a Gibson executive I spoke to many, many years ago. A flower pot on the headstock was the sign of a master luthier. Pot on the bottom, a leaf on each side and the bloom in the middle. This is a simple version; the Byrdland has a much more ornate design. You see this simple inlay on many of the mid-to-upper mid-priced guitars, like the SG Standard and ES-335.
But in all honesty, I've heard Gibson people of the last few years refer to it as a crown inlay; apparently they don't know the history. Ah well....
So, the flower pot is rare on Les Pauls. They are his signature guitar, and his name is proudly written in gold on the headstock. Around 2006, Gibson did a special series of Standards, with Manhattan Midnight, Pacific Reef and Santa Fe Sunrise finishes, with the flower pot inlay and a bound headstock. This design was repeated on the chambered Classic Antique models that followed.
Those are the only two I can think of, but there may be others. Not rare per se, but definitely unusual.
Bill