I just got an email back from Ryan. This is the same movement that I currently have in mine. It is listed as a DG2813, it is actually a Mingzhu DG5833.
https://www.ebay.com/itm/New-Mingzh...cal-Movement-For-Men-Watch-P740-/322898140461
It is an inexpensive yet decent movement as many DG2813s, DG3804s and other variants are. It is a relatively simple mod of the base DG2813, having only one extra gear to drive the GMT wheel and another one the set it independently.
Here are some pics of the movement under the hood during a servicing and an improved datewheel mod for the DG2813 fugly DW.
Here you can see the simple extra gear that lets the hour wheel drive the 24 hour wheel
There is an extra setting wheel to set the GMT wheel
Regarding crown functions, it works like a 2836 ICHS.
Crown 1 - winding
Crown 2 - Quickset date (clockwise)
Crown 2 - GMT wheel set (anti-clockwise)
Crown 3 - Time setting
The GMT wheel setting in crown position 2 is continuous (no discrete steps) which can be a blessing or a curse. I prefer it this way because you have unlimited control over exactly where it is set, unlike a 2836 ICHS GMT hand which jumps only to specific points 1 hour apart dictated by the click spring.
However it can be a little frustrating to set the Sky-D 24 hour wheel exactly where you want it because there is a little lag in the gears so it can shift a little when you push the crown in and the wheel can lag a little til the gears catch after you've reset it. At times I have taken 8 or 10 attempts to bracket my positioning of the wheel before it stayed working the way I wanted it to. Once it is set, it's best to leave it alone.
I will order one of these later today. Ryan confirmed it is "available" now.