The BM54 was manufactured 51/03 from what I can tell.
This was the description:
You are bidding on an original BMW BM54 Professional Radio tuner module.
Fits to BMW E38,E38,E46,X3,X5 also fits'02 to '04 Range Rover
It supports both full TMC messaging and dynamic navigation. This is the new model type with square pins. Manufactured By Becker Germany in 2003.