BM54 set for Area=Oceania

Correct. You have a BM54.

Radio service mode can confirm what model radio it is. Enter the service mode and look for the AREA setting.
If you see an AREA setting, it is a BM54

To enter service mode:
BM53 withWidescreenMonitor PRIOR to 9/01
1. Turn the radio on.
2. Within 8 seconds, press the 'INFO' button.
3. From the Info screen, select RDS (choose PTY on E38).
4. Press and hold the BM control knob (right side knob) for at least 8 seconds.
5. Scroll through functions using the station search buttons "< >".
6. Turn the radio off to leave the service mode.

BM53 withWidescreenMonitor AFTER 9/01
1. Turn the radio on.
2. Immediately press and hold the 'Select' button for at least 8 seconds. The screen will switch to Service Mode.
3. The screen will now show the serial number of the radio.
4. Use the "< >" buttons to select the desired service function.
5. Selections for the desired service function can be made by using the radio station preset buttons #1-6.
6. Turn the radio off to leave the service mode.