Hi Keith, fancy this for cross-town communication!  What you seem to
have is at least unusual.  When you say no numbers, my first thought is
a prototype.

My second thought was that someone replicated a lot of parts which were
unusable, for whatever reason.  But this should still leave some
identification on the comb at a minimum.

Hope some others out there might have some ideas to share.

Ciao.
Olin Tillotson