For Stan, Series I vs Series II has more to do with the master volume control in his playing path.
Vermilion really browns out TONS over time. Add to that a much-yellowed finish, and you've got something that can look very much like Rosewood - until you take a knob off and notice a bright red ring underneath!
Indian Rosewood generally has a much more purpley cast to the color.
Surprisingly, Vermilion and Purpleheart look very similar to me after 30 years on an Alembic instrument, since for both, the color is the main identifier and they both brown out so much. The last image in the first post of this thread would have had me calling Vermilion as a guess now that I've seen so many of these instruments.