Some people are calling it a 2813 , but its really not a 2813.
Its hand sizes, and dial feet placement is not the same as the DG2813 (21 jewel).
Other names for it are POS clone, clone of a clone, Newbreed 2836,hibeat 21J, Hibeat 2813,New breed hibeat (obviously yours is a lowbeat),
Its alot closer to a 2836 than a 2813
Its real name, at least in the 28k version, is Shanghai SB1HRZ2
If you are not worried about the beat being different you can replace it with a 2836
If you want to keep the 21600 beat replace it with a 2846
With either replacement you are going to run into problems with your datedial so will need to use the DWO that is currently on your movement.