The Nervex crown juvela shows is hollow, made of sheet metal wrapped around and welded. Sounds cheap but it's an exceptionally light and strong crown, I have never seen one fail.
The mystery crown is forged solid, no hollow section. Also strong, but not as light. I have made a few forks with that crown, circa 1980, but I don't remember for sure what they were called. The name Vitus is floating up in the Magic 8-ball of my mind, but don't put much weight behind that, I have low confidence that it's right. Vitus (Ateliers de la Rive) of course mostly made frame tubes (prior to the glued aluminum frames), and if they distributed a crown it would have been made by another contractor anyway.

I do know the tangs down the inside of the blades were separate pieces, with just a butt joint with the rest of the crown. Generally just brazed at the same time as the crown-to-blades, any gap filled in with braze and filed smooth after.