Your first ever console is too cool for words. Those Grundig speakers are incredible! You get to work on some fantastically rare, complicated , and sophisticated vintage stuff! That cracked potmetal disk might break further in the future and jamb up the FM part. Might have gone with trying to wipe on some JB weld on it just to stabilize it and keep it in one piece. That was one hell of a restoration job. Thanks for showing it.
To my understanding for that cartridge switch, in Europe 'M' setting was for microgroove (mono or stereo etc) and the 'N' was for _normal_ or 78 groves - kinda strange but the UK equivalent they used 'S' for _standard_ (78s).