Congrats on your decision Nicholas!
I believe that you'll be quite pleased.
To answer your question, no, there will not be a ceramic bezel or insert, even up to the "M" or "Z" serial numbers. Throughout the Sea Dweller's 30+ years, it remained an all-stainless steel case and bezel.
I'm equally sure that if my info is bad, one of the experts will be along shortly to set us to rights ...
Cheers!
Bill