...doesn't look like its going to be doing any movement anytiime soon....we all have to start somewhere I guess!
https://rwg.cc/topic/164731-whats-the-difference-between-a-dg3804b-a-2813/
In summary the thread suggests:
"The 3804B & 2813 are similar but have distinct differences. GMT & Date change layout.
The 2813 can be GMT or standard 3 hands, it has a purple coloured wheel on the auto winding bridge, avoid this as it is lesser quality.
The cousins supplied 3804B was the best movement out of the 3 I have.
Some companies are supplying a 2813GMT and calling it a 3804B, watch out for the purple wheel on the auto winding bridge. If it has this then it's a 2813...shop elswhere"