From the Cousins UK website
Ø26.00mm Movement, China DG2813
Cousins ref: DG2813M
Ø26.00mm Movement, Steel Colour Plates, China DG3804 (3804)
Cousins ref: CH3804BM
The 3804 from CousinsUK is different to the one you show. This is the movement I am using in my 1675. Are the extra wheels leading out to the stem area on yours the function to set the GMT hand independently?
The 3804 I have does not have these wheels and the GMT hand is not settable.