Given the following two files, it seems that a "\(...\)" matching group 
prevents the pattern from matching:

[man.txt] (please note that this is supposed to be
a man page, so the special chars are really 0x8s!
---------------------------------------
      ( (M M- -T TA AB B) )
---------------------------------------

[man.vim]
---------------------------------------
syntax clear

" Try these in order:

""""" Ok """""
"yntax match  manKey  "(\b(\([CM]\)\b\1-\b-[^)]*)\b)"

""""" As I don't need the parens, I added a matching group "\(...\)" at the 
beginning ("\@<=" is not yet present!) """""
"yntax match  manKey  "\((\b(\)\([CM]\)\b\1-\b-[^)]*)\b)"

""""" This works """""
"yntax match  manKey  "(\b(\([CM]\)\b\1-\b-[^)]*)\b)"hs=s+3,he=e-3

highlight     manKey  guibg=black guifg=white
---------------------------------------

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