Not entirely sure the TCM-7 is WM7 based.

Pressman series TCM-7 began earlier than wm-7 

but mechanical same parts inside

+ bigger size

and side control

wm-7 more compact

based in my meaning is not chronological but same basement

Well, it's the same colour

well, got same motivation - playing tapes))

serious - check service manuals for both units, same mechanical parts with same numbers, even body parts same (front panel, under panel)