Well done, Geno. So the Special Pigeon model came with the treble grip. I've never seen one of those.
My Paradox has an extra set of shotgun barrels that were added later. The extra barrels have the third fastener but I thought that was just because they were built to fit to the Paradox gun's action.
I imagine ordering a Royal shotgun with the third fastener cost considerably more than the standard Royal actioned guns. Just out of curiosity, how much was the standard actioned Royal in your catalog?