To anyone outside RWI the main difference in all three watches is the difference in price.
Yes that is either a 2813, or the CHS Modded GMT variant of the 2813, the DG3804

My question is still un answered, i.e. can the GMT Hand be adjusted and does it run at 24 hrs or 12 hrs i.e.half speed of watch hours ?
If it does work as per Gen then it is a good price for what it is.
This old thread refers ....
I saw one of these a couple months back but now the line has expanded quite a bit. A good place to view them all is linked below. Keep in mind Trusty is not a TD on RWI, so send a link of the watch you want to an RWI TD...
forum.replica-watch.info
These watches in my pic link below are much better value for money and available from @RepPossesed fitted with the CHS Modded 2813 ....