Help me diagram this watch movement?

[Guybrush]

Not a Rolex but I think this subforum is the best fit.

As I’m bonding with my new watch (VC with an exhibition caseback) I’m trying to better understand what I’m seeing, and I’m wondering if some of the knowledgeable folks here might be willing to help. I’m including a screencap of the identical movement (borrowed from the web) that I’ve diagrammed. My best guesses, based on some reading, are below. Thanks in any case!

Number 1 is the crown wheel and the ratchet (they move as I wind the watch), and so I assume the barrel with the spring inside of it sits right below that?

Number 2 is a mystery to me—part of the drivetrain (so to speak) that moves the hands?

Number 3 is the balance assembly and I can see the escapement mechanism below it, ticking away.

Number 4 is the center wheel, which turns once an hour (controlling the minute hand) and below that is the wheel that revolves once a minute (controlling the seconds hand).