Bulova 1966 Accutron

Here's an Accutron 214.  The case back is stainless steel, dated M6, marked waterproof, patented, and has a 10 KT GF Bezel.  A black and gold stretch calendar band was already on the watch.
Replaced the Accucell with a new one.  It's humming nicely and keeping time!

I believe it's a 1966 Accuton 214, model 411.  The non-lume dial/hands and 10K GF made me question my choice.  Thanks for your assistance in reviewing my guess!