That's a #3 with #1 wood as you suspected. I'm not aware that the factory ever coined the term "Deluxe". I would guess that the term is "gun broker marketing".
The #1 has been available in higher grades from the factory, but they usually use special distributors such as Lipsy's to do the marketing and sales.
la plus belle des ruses du diable est de vous persuader qu'il n'existe pas!